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fossil fuels are a nonrenewable resource
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natural gas is a kind of fossil fuel
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a home is a kind of building
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natural gas is a source of heat by burning
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gasoline is a kind of fuel
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fuel is a kind of resource
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oil is a source of gasoline
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as the use of a resource decreases , the length of time that resource being available will increases
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as mileage per gallon of gasoline increases , the amount of gasoline used will decrease
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to increase something can mean to extend somthing
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electricity is a kind of alternative fuel
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using a gasoline engine requires burning gasoline
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pollution has a negative impact on the environment / air quality / water quality / society
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an electric motor is a kind of electrical device
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as the use of alternative fuels increases , the use of gasoline will decrease
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if a certain something decreases the use of a resource then that certain something uses less of that resource than a regular something
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if a machine contains a part then that machine uses that part
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an electric car is a kind of machine
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using less of something negative has a positive impact
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an electric car contains an electric motor
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an electrical device can be a part of a machine
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burning gasoline / oil is a source of air pollution
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an electrical device uses electricity to operate
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if something formed from something else over a very long period of time then that something else existed a very long time ago
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prehistoric means a very long time ago
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if a living thing dies then that living thing is dead
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fossil fuels / fossils forming occurs over a period of 300000000 years which is considered a very long time to a human
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oil is a kind of fossil fuel
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a living thing is an organism
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an animal is a kind of organism
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dead organisms decay
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fossil fuels / fossils are formed from dead organisms over time
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an automobile is a kind of vehicle
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vehicles usually require gasoline to operate
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if something comes from something else then that something else is a source of that something
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oil is a source of gasoline
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a nonrenewable resource is limited in supply
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oil is a nonrenewable resource
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alternative fuels are being used in some automobiles
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for something to be replaced means for something else to be used instead of that something
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if a resource is limited in supply then that resource needs to be replaced
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a limited resource means a resource that is limited in supply
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two million or more years means millions of years
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fossil fuels are a nonrenewable resource
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fossil fuels / fossils forming occurs over a period of 300000000 years which is considered a very long time to a human
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years are a kind of unit for measuring time
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how long something takes is a kind of measurement of time
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a period is a kind of measurement of time
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300000000 years equals three hundred million years
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a source of something emits / produces / generates / provides that something
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biomass is a renewable resource
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using biomass to produce energy is a source of pollution
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if something emits something else then that something increases the amount of that something else
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electrical energy is a kind of energy
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a home is a kind of building
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energy is used for heating a building by a heating system
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a solar panel converts sunlight / solar energy into electrical energy / electricity
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solar energy is a renewable / inexhaustible resource
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a solar panel is a kind of object
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if an object converts something into something else, then that object uses that something to produce that something else
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a desert environment usually has a lot of sunlight
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solar energy is a renewable / inexhaustible resource
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if an environment has something then that something can be found in that environment
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solar energy is a kind of resource
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sunlight is a kind of solar energy
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if there is a lot of a resource found in an environemnt then that resource is a common resource in that environment
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sunlight is a kind of solar energy
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solar energy is a renewable / inexhaustible resource
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solar energy is a renewable / inexhaustible resource
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sunlight is a kind of solar energy
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wind / wind energy is a renewable / inexhaustible resource
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trees are a renewable resource
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decreasing the number of something limits the supply of that something
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cutting down trees in a forest causes the number of trees to decrease in that forest
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renewable resources can be used over again
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water is a renewable resource
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the water cycle is a kind of natural process
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the water cycle recycles water throughout the earth over time
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a river is a kind of flowing / moving body of water
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moving water on earth is a part of water cycle
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a natural process is performed by nature
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recyclable means a material can be recycled / reused many times
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renewable resources can be used over again
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wind / wind energy is a renewable / inexhaustible resource
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an energy source is a kind of resource
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wind is an inexhaustible resource
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wind is a source of energy
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an inexhaustible resource is a kind of renewable resource
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an energy source is a kind of resource
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to be inexhaustible means to always be available
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wind is a source of energy
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wind / wind energy is a renewable / inexhaustible resource
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a source of energy is a kind of energy resource
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a tree contains wood
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trees are a renewable resource
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aluminum is recyclable
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recycling nonrenewable resources has a positive impact on the conservation of those resources
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a soda can is made of aluminum
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aluminum is a nonrenewable resource
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soil is a kind of resource
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