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Acid_value | In chemistry , acid value ( or `` neutralization number '' or `` acid number '' or `` acidity '' ) is the mass of potassium hydroxide ( KOH ) in milligrams that is required to neutralize one gram of chemical substance . The acid number is a measure of the amount of carboxylic acid groups in a chemical compound , such a... | |
Agricultural_policy_of_the_United_States | The agricultural policy of the United States is composed primarily of the periodically renewed federal U.S. farm bills . | |
Academic_dishonesty | Academic dishonesty , academic misconduct or academic fraud is any type of cheating that occurs in relation to a formal academic exercise . It can include Plagiarism : The adoption or reproduction of original creations of another author ( person , collective , organization , community or other type of author , includi... | |
AccuWeather_Network | The AccuWeather Network is an American cable television network that is owned by AccuWeather . The network broadcasts pre-recorded national and regional weather forecasts , analysis of ongoing weather events , and weather-related news , along with local weather segments for mostly the Northeastern United States . The n... | |
Abrupt_climate_change | An abrupt climate change occurs when the climate system is forced to transition to a new climate state at a rate that is determined by the climate system energy-balance , and which is more rapid than the rate of change of the external forcing . Past events include the end of the Carboniferous Rainforest Collapse , Youn... | |
Agricultural_land | Agricultural land is typically land devoted to agriculture , the systematic and controlled use of other forms of lifeparticularly the rearing of livestock and production of cropsto produce food for humans . It is thus generally synonymous with farmland or cropland . The United Nations Food and Agriculture Organizatio... | |
5160_Camoes | 5160 Camoes , provisional designation , is an asteroid from the inner regions of the asteroid belt , approximately 6 kilometers in diameter . It was discovered on 23 December 1979 , by Belgian astronomer Henri Debehogne and Brazilian astronomer Edgar Netto at ESO 's La Silla Observatory in northern Chile . The astero... | |
Agriculture,_forestry,_and_fishing_in_Japan | Agriculture , farming , and fishing form the primary sector of industry of the Japanese economy , together with the Japanese mining industry , but together they account for only 1.3 % of gross national product . Only 20 % of Japan 's land is suitable for cultivation , and the agricultural economy is highly subsidized .... | |
APA_Ethics_Code | The American Psychological Association ( APA ) Ethical Principles of Psychologists and Code of Conduct ( for short , the Ethics Code , as referred to by the APA ) includes an introduction , preamble , a list of five aspirational principles and a list of ten enforceable standards that psychologists use to guide ethical ... | |
Acrodermatitis | Acrodermatitis / ac · ro · der · ma · ti · tis / is a childhood form of dermatitis selectively affecting the hands and feet and may be accompanied by mild symptoms of fever and malaise . It may also be associated with hepatitis B and other viral infections . The lesions appear as small coppery-red , flat-topped firm p... | |
Agnosticism | Agnosticism is the view that the existence of God or the supernatural is unknown or unknowable . According to the philosopher William L. Rowe , `` agnosticism is the view that human reason is incapable of providing sufficient rational grounds to justify either the belief that God exists or the belief that God does no... | |
Achievement_gap_in_the_United_States | The achievement gap in the United States refers to the observed , persistent disparity in measures of educational performance among subgroups of U.S. students , especially groups defined by socioeconomic status ( SES ) , race/ethnicity and gender . The achievement gap can be observed on a variety of measures , includin... | |
Acidulated_water | Acidulated water is water where some sort of acid is added -- often lemon juice , lime juice , or vinegar -- to prevent cut or skinned fruits or vegetables from browning so as to maintain their appearance . Some vegetables and fruits which are often placed in acidulated water are : apples , avocados , celeriac , potato... | |
Acclimatization | Acclimatization or acclimatisation ( also called acclimation or acclimatation ) is the process in which an individual organism adjusts to a change in its environment ( such as a change in altitude , temperature , humidity , photoperiod , or pH ) , allowing it to maintain performance across a range of environmental cond... | |
60th_parallel_south | The 60th parallel south is a circle of latitude that is 60 degrees south of the Earth 's equatorial plane . No land lies on the parallel -- it crosses nothing but ocean . The closest land is a group of rocks north of Coronation Island ( Melson Rocks or Governor Islands ) of the South Orkney Islands , which are about 54... | |
Acidophiles_in_acid_mine_drainage | The outflow of acidic liquids and other pollutants from mines is often catalysed by acid-loving microorganisms ; these are the acidophiles in acid mine drainage . Acidophiles are not just present in exotic environments such as Yellowstone National Park or deep-sea hydrothermal vents . Genera such as Acidithiobacillus... | |
Agriculture_in_Ethiopia | Agriculture in Ethiopia is the foundation of the country 's economy , accounting for half of gross domestic product ( GDP ) , 83.9 % of exports , and 80 % of total employment . Ethiopia 's agriculture is plagued by periodic drought , soil degradation caused by overgrazing , deforestation , high levels of taxation and... | |
Agriculture | Agriculture or farming is the cultivation and breeding of animals , plants and fungi for food , fiber , biofuel , medicinal plants and other products used to sustain and enhance human life . Agriculture was the key development in the rise of sedentary human civilization , whereby farming of domesticated species created... | |
Agribusiness | Agribusiness is the business of agricultural production . The term was coined in 1957 by Goldberg and Davis . It includes agrichemicals , breeding , crop production ( farming and contract farming ) , distribution , farm machinery , processing , and seed supply , as well as marketing and retail sales . All agents of the... | |
Acreage_Reduction_Program | In the United States , the Acreage Reduction Program ( ARP ) is a no-longer-authorized annual cropland retirement program for wheat , feed grains , cotton , or rice in which farmers participating in the commodity programs ( in order to be eligible for nonrecourse loans and deficiency payments ) were mandated to idle a ... | |
Aether_theories | Aether theories ( also known as ether theories ) in physics propose the existence of a medium , the aether ( also spelled ether , from the Greek word , meaning `` upper air '' or `` pure , fresh air '' ) , a space-filling substance or field , thought to be necessary as a transmission medium for the propagation of elect... | |
5692_Shirao | 5692 Shirao , provisional designation , is a stony Eunomia asteroid from the middle region of the asteroid belt , approximately 9 kilometers in diameter . It was discovered on 23 March 1992 , by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory , Hokkaidō , Japan . The asteroid is a me... | |
Advection | In physics , engineering , and earth sciences , advection is the transport of a substance by bulk motion . The properties of that substance are carried with it . Generally the majority of the advected substance is a fluid . The properties that are carried with the advected substance are conserved properties such as ene... | |
Absolute_risk_reduction | In epidemiology , the absolute risk reduction , risk difference or absolute effect is the change in the risk of an outcome of a given treatment or activity in relation to a comparison treatment or activity . It is the inverse of the number needed to treat . In general , absolute risk reduction is the difference betwe... | |
Abiogenic_petroleum_origin | Abiogenic petroleum origin is a term used to describe a number of different hypotheses which propose that petroleum and natural gas are formed by inorganic means rather than by the decomposition of organisms . The two principal abiogenic petroleum hypotheses , the deep gas hypothesis of Thomas Gold and the deep abiotic... | |
Acciona_Energy | Acciona Energy , a subsidiary of Acciona based in Madrid , is a Spanish company developing renewable energy projects , including small hydro , biomass , solar energy and thermal energy , and the marketing of biofuels . It also has assets in the field of co-generation and wind turbine manufacture . , it is carrying out ... | |
433_Eros | 433 Eros is an S-type near-Earth asteroid approximately 34.4 * in size , the second-largest near-Earth asteroid after 1036 Ganymed . It was discovered in 1898 and was the first near-Earth asteroid discovered . It was the first asteroid orbited by an Earth probe ( in 2000 ) . It belongs to the Amor group . Eros is a M... | |
Activated_carbon | Activated carbon , also called activated charcoal , is a form of carbon processed to have small , low-volume pores that increase the surface area available for adsorption or chemical reactions . Activated is sometimes substituted with active . Due to its high degree of microporosity , just one gram of activated carbo... | |
Aggregate_demand | In macroeconomics , aggregate demand ( AD ) or domestic final demand ( DFD ) is the total demand for final goods and services in an economy at a given time . It specifies the amounts of goods and services that will be purchased at all possible price levels . This is the demand for the gross domestic product of a countr... | |
45th_parallel_south | The 45th parallel south is a circle of latitude that is 45 degrees south of the Earth 's equatorial plane . It is the line that marks the theoretical halfway point between the equator and the South Pole . The true halfway point is 16.2 kilometres ( 10.1 mi ) south of this parallel because the Earth is not a perfect sp... | |
Agricultural_cooperative | An agricultural cooperative , also known as a farmers ' co-op , is a cooperative where farmers pool their resources in certain areas of activity . A broad typology of agricultural cooperatives distinguishes between agricultural service cooperatives , which provide various services to their individually farming members... | |
Aerobic_methane_production | Aerobic methane production is a potential biological pathway for atmospheric methane ( CH4 ) production under oxygenated conditions . The existence of this pathway was first theorized in 2006 . While significant evidence suggests the existence of this pathway , it remains poorly understood and its existence is controve... | |
Acid_rain | Acid rain is a rain or any other form of precipitation that is unusually acidic , meaning that it possesses elevated levels of hydrogen ions ( low pH ) . It can have harmful effects on plants , aquatic animals and infrastructure . Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide , which react with ... | |
Advice_(constitutional) | Advice , in constitutional law , is formal , usually binding , instruction given by one constitutional officer of state to another . Especially in parliamentary systems of government , heads of state often act on the basis of advice issued by prime ministers or other government ministers . For example , in constitution... | |
Agriculture_in_Pennsylvania | Agriculture is a major industry in the U.S. commonwealth of Pennsylvania . As of the most recent United States Census of Agriculture conducted in 2012 , there were 59,309 farms in Pennsylvania , covering an area of 7704444 acre with an average size of 130 acre per farm . Pennsylvania ranks first in the United States in... | |
Adam_Scaife | Adam Arthur Scaife B.A. M.A. MSc PhD FRMetS ( born 18 March 1970 ) is a British physicist , and head of long range prediction at the Met Office . He is an honorary visiting Professor at Exeter University . Scaife carries out research into long range weather forecasting and computer modelling of the climate . Scaife has... | |
Acid | An acid is a molecule or ion capable of donating a hydron ( proton or hydrogen ion H + ) , or , alternatively , capable of forming a covalent bond with an electron pair ( a Lewis acid ) . The first category of acids is the proton donors or Brønsted acids . In the special case of aqueous solutions , proton donors form... | |
Acid_mine_drainage | Acid mine drainage , acid and metalliferous drainage ( AMD ) , or acid rock drainage ( ARD ) refers to the outflow of acidic water from metal mines or coal mines . Acid rock drainage occurs naturally within some environments as part of the rock weathering process but is exacerbated by large-scale earth disturbances c... | |
Agriculture_in_Syria | Until the mid-1970s , agriculture in Syria had been the primary economic activity . At independence in 1946 , agriculture ( including minor forestry and fishing ) was the most important sector of the economy , and in the 1940s and early 1950s , agriculture was the fastest growing sector . Wealthy merchants from such ur... | |
ASHRAE_90.1 | ASHRAE 90.1 ( Energy Standard for Buildings Except Low-Rise Residential Buildings ) is an international standard that provides minimum requirements for energy efficient designs for buildings except for low-rise residential buildings . The original standard , ASHRAE 90 , was published in 1975 . There have been multiple ... | |
Abyssal_hill | An abyssal hill is a small hill that rises from the floor of an abyssal plain . They are the most abundant geomorphic structures on the planet Earth , covering more than 30 % of the ocean floors . Abyssal hills have relatively sharply defined edges and climb to heights of no more than a few hundred meters . They can b... | |
Agriculture_in_Brazil | The agriculture of Brazil is historically one of the principal bases of Brazil 's economy . While its initial focus was on sugarcane , Brazil eventually became the world 's largest exporter of coffee , soybeans , beef , and crop-based ethanol . The success of agriculture during the Estado Novo ( New State ) , with Ge... | |
Acidophobe | The terms Acidophobe/Acidophobia / / Acidophoby/Acidophobic refer to intolerace to acidic environments . The term is variously applied to plants , bacteria , protozoa , animals , chemical compounds , etc. . The antonymous term is `` acidophile '' . Cf. `` alkaliphile '' . The name is actually a misnomer as it combines ... | |
6th_century | The 6th century is the period from 501 to 600 in accordance with the Julian calendar in the Common Era . In the West this century marks the end of Classical Antiquity and the beginning of the Middle Ages . Following the collapse of the Western Roman Empire late in the previous century , Europe fractured into many small... | |
49th_parallel_north | The 49th parallel north is a circle of latitude that is 49 degrees north of the Earth 's equatorial plane . It crosses Europe , Asia , the Pacific Ocean , North America , and the Atlantic Ocean . The city of Paris is about 15 km south of the 49th parallel and is the largest city between the 48th and 49th parallels . ... | |
Acre | The acre is a unit of land area used in the imperial and US customary systems . It is defined as the area of 1 chain by 1 furlong ( 66 by 660 feet ) , which is exactly equal to of a square mile , 43,560 square feet , approximately 4,047 m2 , or about 40 % of a hectare . The acre is commonly used in Antigua and Barbud... | |
AccuWeather | AccuWeather Inc. is an American media company that provides commercial weather forecasting services worldwide . AccuWeather was founded in 1962 by Joel N. Myers , then a Pennsylvania State University graduate student working on a degree in meteorology . His first customer was a gas company in Pennsylvania . While run... | |
American_Recovery_and_Reinvestment_Act_of_2009 | The American Recovery and Reinvestment Act of 2009 ( ARRA ) , nicknamed the Recovery Act , was a stimulus package enacted by the 111th U.S. Congress and signed into law by President Barack Obama in February 2009 . Developed in response to the Great Recession , the ARRA 's primary objective was to save existing jobs and... | |
Ambivalence | Ambivalence is a state of having simultaneous conflicting reactions , beliefs , or feelings towards some object . Stated another way , ambivalence is the experience of having an attitude towards someone or something that contains both positively and negatively valenced components . The term also refers to situations wh... | |
Algae_fuel | Algae fuel , algal biofuel , or algal oil is an alternative to liquid fossil fuels that uses algae as its source of energy-rich oils . Also , algae fuels are an alternative to common known biofuel sources , such as corn and sugarcane . Several companies and government agencies are funding efforts to reduce capital and ... | |
Alluvial_plain | An alluvial plain is a largely flat landform created by the deposition of sediment over a long period of time by one or more rivers coming from highland regions , from which alluvial soil forms . A floodplain is part of the process , being the smaller area over which the rivers flood at a particular period of time , wh... | |
Air_conditioned_clothing | Air conditioned clothing is a term for clothing that actively cools down the wearer . It has primarily been used by workers in areas where air conditioning systems can not be easily installed , such as tunnels and underground construction sites . Air-conditioned clothing on the market does not operate by actually cooli... | |
Alpha_particle | Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus . They are generally produced in the process of alpha decay , but may also be produced in other ways . Alpha particles are named after the first letter in the Greek alphabet , α . The symbol for the alph... | |
Albuquerque,_New_Mexico | Albuquerque ( -LSB- ˈælbəˌkɜɹki -RSB- ) is the most populous city in the U.S. state of New Mexico . The high-elevation city serves as the county seat of Bernalillo County , and it is situated in the central part of the state , straddling the Rio Grande . The city population is 557,169 as of the July 1 , 2014 population... | |
Alberta | Alberta ( -LSB- ælˈbɜrtə -RSB- ) is a western province of Canada . With an estimated population of 4,067,175 as of 2016 census , it is Canada 's fourth-most populous province and the most populous of Canada 's three prairie provinces . Its area is about 660,000 km2 . Alberta and its neighbour Saskatchewan were district... | |
Air_source_heat_pumps | An air source heat pump ( ASHP ) is a system which transfers heat from outside to inside a building , or vice versa . Under the principles of vapor compression refrigeration , an ASHP uses a refrigerant system involving a compressor and a condenser to absorb heat at one place and release it at another . They can be use... | |
American_Association_of_State_Climatologists | The American Association of State Climatologists ( AASC ) is a professional scientific organisation for climatologists in the United States . The organisation was founded in 1976 . The core membership in the AASC consists of the 47 State Climatologists and the official climatologist of Puerto Rico . There is one Stat... | |
Amos-3 | AMOS-3 , also known as AMOS-60 is an Israeli communications satellite operated by Spacecom . The satellite is powered by twin solar panels , and is based on the Israeli AMOS bus . It replaced AMOS-1 in geosynchronous orbit at 4 ° W. AMOS-3 carries fifteen Ku/Ka-band transponders , and is expected to have an on-orbit li... | |
Aliso_Canyon_gas_leak | The Aliso Canyon gas leak ( also called Porter Ranch gas leak and Porter Ranch gas blowout ) was a massive natural gas leak that was discovered by SoCalGas employees on October 23 , 2015 . Gas was escaping from a well within the Aliso Canyon 's underground storage facility in the Santa Susana Mountains near Porter Ranc... | |
American_Electric_Power | American Electric Power ( AEP ) is a major investor-owned electric utility in the United States , delivering electricity to more than five million customers in 11 states . AEP ranks among the nation 's largest generators of electricity , owning nearly 38,000 megawatts of generating capacity in the U.S. AEP also owns ... | |
Air_pollution_in_the_United_States | Air pollution is the introduction of chemicals , particulate matter , or biological materials that cause harm or discomfort to humans or other living organisms , or damages the natural environment into the atmosphere . Ever since the beginning of the Industrial Revolution in the United States , America has had much tro... | |
An_Appeal_to_Reason | An Appeal to Reason : A Cool Look at Global Warming is a 2008 book by Nigel Lawson . In it , Lawson argues that global warming is happening , but that the science is far from settled . He opposes the scientific consensus as summarized by the IPCC . He also argues that warming will bring both benefits and negative conse... | |
Alternative_fuel_vehicle | An alternative fuel vehicle is a vehicle that runs on a fuel other than traditional petroleum fuels ( petrol or Diesel fuel ) ; and also refers to any technology of powering an engine that does not involve solely petroleum ( e.g. electric car , hybrid electric vehicles , solar powered ) . Because of a combination of fa... | |
Amundsen–Scott_South_Pole_Station | The Amundsen -- Scott South Pole Station is a United States scientific research station at the South Pole , the southernmost place on the Earth . The station is located on the high plateau of Antarctica at an elevation of 2,835 metres ( 9,301 feet ) above sea level and is administered by the Division of Polar Programs ... | |
Amundsen's_South_Pole_expedition | The first expedition to reach the geographic South Pole was led by the Norwegian explorer Roald Amundsen . He and four others arrived at the pole on 14 December 1911 , five weeks ahead of a British party led by Robert Falcon Scott as part of the Terra Nova Expedition . Amundsen and his team returned safely to their bas... | |
American_Jobs | American Jobs is a 2004 independent film , documentary , written , produced and directed by Greg Spotts . The film is about the loss of American jobs to low-wage foreign competition , covering the phenomenon of outsourcing in manufacturing and high-paying white-collar jobs . The filmmaker visited 19 cities and towns th... | |
Alpujarras | The Alpujarra is a natural and historical region in Andalusia , Spain , on the south slopes of the Sierra Nevada and the adjacent valley . The average elevation is 4000 feet above sea level . It extends over two provinces , Granada and Almería ; it is sometimes referred to in the plural as `` Las Alpujarras '' . There ... | |
Alternative_minimum_tax | The alternative minimum tax ( AMT ) is a supplemental income tax imposed by the United States federal government required in addition to baseline income tax for certain individuals , corporations , estates , and trusts that have exemptions or special circumstances allowing for lower payments of standard income tax . AM... | |
Alternative_cancer_treatments | Alternative cancer treatments are alternative or complementary treatments for cancer that have not been approved by the government agencies responsible for the regulation of therapeutic goods . They include diet and exercise , chemicals , herbs , devices , and manual procedures . The treatments are not supported by evi... | |
Air_conditioning | Air conditioning ( often referred to as AC , A.C. , or A/C ) is the process of removing heat from a confined space , thus cooling the air , and removing humidity . Air conditioning can be used in both domestic and commercial environments . This process is used to achieve a more comfortable interior environment , typica... | |
Air_pollution | Air pollution occurs when harmful substances including particulates and biological molecules are introduced into Earth 's atmosphere . It may cause diseases , allergies or death in humans ; it may also cause harm to other living organisms such as animals and food crops , and may damage the natural or built environment ... | |
Ames_Research_Center | Ames Research Center ( ARC ) , also known as NASA Ames , is a major NASA research center at Moffett Federal Airfield in California 's Silicon Valley . It was founded as the second National Advisory Committee for Aeronautics ( NACA ) laboratory . That agency was dissolved and its assets and personnel transferred to the ... | |
Amblyomma_americanum | Amblyomma americanum , also known as the Lone Star Tick , the Northeastern Water Tick , or the Turkey Tick , is a type of tick indigenous to much of the eastern United States and Mexico , that bites painlessly and commonly goes unnoticed , remaining attached to its host for as long as seven days until it is fully engor... | |
Amur_bitterling | Not to be confused with Rhodeus amurensis , whose scientific name literally means `` Amur bitterling '' The Amur bitterling ( Rhodeus sericeus ) is a small fish of the carp family . It is sometimes just called `` bitterling '' , which dates back to the time when the European bitterling ( Rhodeus amarus ) was still co... | |
Air_mass_(astronomy) | In astronomy , air mass ( or airmass ) is the optical path length through Earth 's atmosphere for light from a celestial source . As it passes through the atmosphere , light is attenuated by scattering and absorption ; the more atmosphere through which it passes , the greater the attenuation . Consequently , celestial ... | |
Algal_bloom | An algal bloom is a rapid increase or accumulation in the population of algae in freshwater or marine water systems , and is recognized by the discoloration in the water from their pigments . Cyanobacteria were mistaken for algae in the past , so cyanobacterial blooms are sometimes also called algal blooms . Blooms whi... | |
Amundsen_Basin | The Amundsen Basin , with depths up to 4.4 km , is the deepest abyssal plain in the Arctic Ocean . The Amundsen Basin is embraced by the Lomonosov Ridge ( from to ) and the Gakkel Ridge ( from to ) . It is named after the polar researcher Roald Amundsen . Together with the Nansen Basin , the Amundsen Basin is often sum... | |
Alkalinity | Alkalinity is the name given to the quantitative capacity of an aqueous solution to neutralize an acid . Measuring alkalinity is important in determining a stream 's ability to neutralize acidic pollution from rainfall or wastewater . It is one of the best measures of the sensitivity of the stream to acid inputs . Ther... | |
Alaska_Department_of_Environmental_Conservation_v._EPA | Alaska Dept. of Environmental Conservation v. EPA , , is a U.S. Supreme Court case clarifying the scope of state environmental regulators as well as the Environmental Protection Agency ( EPA ) . In a 5-4 decision , the Supreme Court found the EPA has authority to overrule state agency decisions under the Clean Air Act ... | |
Alexandre_Trudeau | Alexandre Emmanuel `` Sacha '' Trudeau ( born December 25 , 1973 ) is a Canadian filmmaker , journalist and author of Barbarian Lost . He is the second son of Canada 's former Prime Minister Pierre Trudeau , and Margaret Trudeau , and the younger brother of Canada 's current Prime Minister Justin Trudeau . | |
Americas | The Americas ( also collectively called America ) encompass the totality of the continents of North and South America . Together , they make up most of the land in Earth 's western hemisphere and comprise the New World . Along with their associated islands , they cover 8 % of Earth 's total surface area and 28.4 % of... | |
Alternatives_assessment | Alternatives assessment or alternatives analysis is a problem-solving approach used in environmental design , technology , and policy . It aims to minimize environmental harm by comparing multiple potential solutions in the context of a specific problem , design goal , or policy objective . It is intended to inform dec... | |
Alternative_energy | Alternative energy is any energy source that is an alternative to fossil fuel . These alternatives are intended to address concerns about such fossil fuels , such as its high carbon dioxide emissions , an important factor in global warming . Marine energy , hydroelectric , wind , geothermal and solar power are all alte... | |
Al_Gore | Albert Arnold Gore Jr. ( born March 31 , 1948 ) is an American politician and environmentalist who served as the 45th Vice President of the United States from 1993 to 2001 under President Bill Clinton . He was Clinton 's running mate in their successful campaign in 1992 , and was re-elected in 1996 . At the end of Clin... | |
Air_quality_index | An air quality index ( AQI ) is a number used by government agencies to communicate to the public how polluted the air currently is or how polluted it is forecast to become . As the AQI increases , an increasingly large percentage of the population is likely to experience increasingly severe adverse health effects . Di... | |
Alaska-St._Elias_Range_tundra | The Alaska-St . Elias Range tundra is an ecoregion of northwestern North America . | |
Allergy | Allergies , also known as allergic diseases , are a number of conditions caused by hypersensitivity of the immune system to something in the environment that usually causes little or no problem in most people . These diseases include hay fever , food allergies , atopic dermatitis , allergic asthma , and anaphylaxis . S... | |
Alkaline_tide | Alkaline tide refers to a condition , normally encountered after eating a meal , where during the production of hydrochloric acid by parietal cells in the stomach , the parietal cells secrete bicarbonate ions across their basolateral membranes and into the blood , causing a temporary increase in pH. During hydrochlor... | |
An_Inconvenient_Truth | An Inconvenient Truth is a 2006 American documentary film directed by Davis Guggenheim about former United States Vice President Al Gore 's campaign to educate citizens about global warming via a comprehensive slide show that , by his own estimate made in the film , he has given more than a thousand times . The idea to... | |
An_Act_to_amend_the_Criminal_Code_(minimum_sentence_for_offences_involving_trafficking_of_persons_under_the_age_of_eighteen_years) | An Act to amend the Criminal Code ( minimum sentence for offences involving trafficking of persons under the age of eighteen years ) was a private member 's bill that was enacted on June 29 , 2010 by the 40th Canadian Parliament . Until that time , no other private member 's bill had passed since the 2008 Canadian fede... | |
Algae | Algae ( -LSB- ˈældʒi , _ ˈælɡi -RSB- singular alga -LSB- ˈælɡə -RSB- ) is an informal term for a large , diverse group of photosynthetic organisms which are not necessarily closely related , and is thus polyphyletic . Included organisms range from unicellular genera , such as Chlorella and the diatoms , to multicellula... | |
Alternative_fuel | Alternative fuels , known as non-conventional and advanced fuels , are any materials or substances that can be used as fuels , other than conventional fuels like ; fossil fuels ( petroleum ( oil ) , coal , and natural gas ) , as well as nuclear materials such as uranium and thorium , as well as artificial radioisotope ... | |
Amery_Ice_Shelf | The Amery Ice Shelf is a broad ice shelf in Antarctica at the head of Prydz Bay between the Lars Christensen Coast and Ingrid Christensen Coast . It is part of Mac . Robertson Land . The name `` Cape Amery '' was applied to a coastal angle mapped on February 11 , 1931 by the British Australian New Zealand Antarctic Res... | |
Air_Pollution_Control_Act | The Air Pollution Control Act of 1955 ( , ch . 360 , ) was the first Clean Air Act ( United States ) enacted by Congress to address the national environmental problem of air pollution on July 14 , 1955 . This was `` an act to provide research and technical assistance relating to air pollution control '' . The act `` le... | |
Alps | The Alps ( -LSB- ælps -RSB- Alpes -LSB- alp -RSB- Alpen -LSB- ˈalpən -RSB- Alpi -LSB- ˈalpi -RSB- Alps Alpe -LSB- ˈáːlpɛ -RSB- ) are the highest and most extensive mountain range system that lies entirely in Europe , The Caucasus Mountains are higher , and the Urals longer , but both lie partly in Asia . stretching app... | |
Airborne_fraction | The airborne fraction is a scaling factor defined as the ratio of the annual increase in atmospheric to the emissions from anthropogenic sources . It represents the proportion of human emitted that remains in the atmosphere . The fraction averages about 45 % , meaning that approximately half the human-emitted is absorb... | |
Alta_Wind_Energy_Center | Alta Wind Energy Center ( AWEC ) , also known as Mojave Wind Farm , is the third largest onshore wind energy project in the world . The Alta Wind Energy Center is a wind farm located in Tehachapi Pass of the Tehachapi Mountains , in Kern County , California . As of 2013 , it is the largest wind farm in the United State... | |
Alkane | In organic chemistry , an alkane , or paraffin ( a historical name that also has other meanings ) , is an acyclic saturated hydrocarbon . In other words , an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon-carbon bonds are single . Alkanes have the general chemical form... | |
Alternative_medicine | Alternative medicine -- or fringe medicine -- includes practices claimed to have the healing effects of medicine but which are disproven , unproven , impossible to prove , or are excessively harmful in relation to their effect ; and where the scientific consensus is that the therapy does not , or can not , work because... | |
Anticyclogenesis | Anticyclogenesis is the development or strengthening of anticyclonic circulation in the atmosphere . It is the opposite of anticyclolysis , and has a cyclonic equivalent -- cyclogenesis . Anticyclones are alternatively referred to as high pressure systems . High pressure areas form due to downward motion through the tr... |
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