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aluminum is a kind of metal
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trash is similar to waste
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recycling decreases the amount of waste sent to landfills
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recycling nonrenewable resources has a positive impact on the environment
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recycling is a kind of method of disposal
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aluminum is a kind of material
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recyclable means a material can be recycled many times
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aluminum is a nonrenewable resource
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aluminum is recyclable
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cardboard is inexpensive in cost
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cardboard is recyclable
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cardboard is a kind of material
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cardboard is biodegradable
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the inner core is located in the center of the earth
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the pressure at the center of the earth is extremely high
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extreme high pressure causes the inner core of earth to be in solid state
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the oceanic crust mainly is made of basalt
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the continental crust mainly is made of granite
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basalt is more dense than granite
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the mantle is the largest layer of the earth
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the mantle is located between the crust and the outer core
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earthquakes causes older rock to be on top of younger rock
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earthquakes cause rock layers to fold on top of each other
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basalt is a kind of material
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granite is a kind of material
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the mantle of the earth is mainly made of silicate
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silicate is a kind of material
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waves travel at different speed in different medium
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different media are made of different materials
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an earthquake wave is a kind of wave
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the crust of the earth is made of basalt or granite
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active volcanoes are most common along tectonic plate boundaries
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earthquakes are most common along tectonic plate boundaries
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california is located on the boundary of two tectonic plates
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earthquakes are most common along tectonic plate boundaries
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massachusetts is not located on the boundary of two tectonic plates
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all waves transmit energy from one place to another
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an earthquake wave is a kind of wave
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mountains are formed by plate tectonics
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the appalachian mountains are a kind of mountain
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the appalachian mountains are a kind of mountain
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a mountain range is formed by rocks folding upon one another
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the collision of tectonic plates are found at the convergent boundaries
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the collision of the boundaries causes rocks to fold
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a volcanic eruption is a kind of quick process
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new land can be formed by volcanoes erupting by lava cooling
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magma cooling can form volcanic mountains
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the subduction of tectonic plates may cause magma to surface from underneath
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the oceanic plate is a kind of tectonic plate
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magma cools down when it comes to the surface from underneath
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volcanic ash in the atmosphere decreases the temperature by blocking the sun
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europe was unusally cold and had acid rain in 1783
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emitting sulfur dioxide causes acid rain
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an erupting volcano releases sulfur gas and ash into the atmosphere
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the amount of sunlight usually is the same at the locations with same latitude
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the intensity of sunlight is a kind of seasonal weather pattern
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nitrogen is a kind of gas
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most means over 50% of something
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the earth 's atmosphere is made of 78 percent nitrogen by mass
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the earth 's atmosphere is made of 21 percent oxygen by volume
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most means over 50% of something
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the earth 's atmosphere is made of 78 percent nitrogen by volume
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the earth 's atmosphere is made of 78 percent nitrogen by volume
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the earth's atmosphere is made of 04% to 1% of water vapor by volume
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the earth 's atmosphere is made of 21 percent oxygen by volume
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the earth 's atmosphere is made of 036 percent carbon dioxide by volume
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as altitude increases , the temperature of the air will decrease in the troposphere
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an increase is the opposite of a decrease
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as the altitude increases , the temperature of the air will increase in the stratosphere
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carbon dioxide is a kind of greenhouse gas
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the earth 's atmosphere is made of 04 to 1 percent water vapor by volume
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04 is bigger than 0036
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the earth 's atmosphere is made of 036 percent carbon dioxide by volume
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water vapor is a kind of greenhouse gas
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the earth 's atmosphere is made of 78 percent nitrogen by mass
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most means over 50% of something
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aurora is a kind of atmospheric phenomena
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an aurora is created by charged particles interact with magnetosphere
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photosynthesis is a source of oxygen
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early photosynthetic life is a kind of photosynthetic life
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earth had no / little oxygen a very long time ago
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the photosynthetic life performs photosynthesis
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early photosynthetic life existed a long time ago
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a source of something increases the amount of that something
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oxygen level describes an amount of oxygen
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an ocean is a kind of body of water
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oceans cover 70% of the surface of the earth
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most means over 50% of something
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majority means over 50% of something
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earth contains glaciers / ice caps
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ice caps and glaciers contain 69% of the freshwater on earth
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most means over 50% of something
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ice sheet is a kind of glacier
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glaciers are a kind of major reservoir
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ice caps and glaciers contain 69% of freshwater on earth
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deflection is when an object changes its moving direction
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the drag of wind causes the surface of the water to change its direction toward the direction of the wind
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oxygen is more common than hydrogen on earth
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oceans contain most of earth 's water
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water is made of hydrogen and oxygen
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