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if something can be used to determine a property of something else then that something can likely be used to determine that property of a part of that something else
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the law of superposition can be used to determine the relative age of the rock
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age is a property of rocks
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plastic is a kind of material made by humans
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natural means grown in nature
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made by humans / artificial is the opposite of natural
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a plastic spoon is made of plastic
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fossil fuel is a kind of fuel
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a mine produces minerals
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mining is when humans take rocks and minerals from the ground
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a source of something emits / produces / generates / provides that something
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the ground is part of the earth
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coal is a kind of fossil fuel
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fuel is a kind of energy source
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a coal mine is a source of coal under the ground
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a coal mine is a kind of mine
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burning coal is a source of air pollution
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using coal requires burning coal
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a problem has a possible negative impact on a thing
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pollution has a negative impact on the environment / air quality / water quality / society
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damage has a negative impact on a thing
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coal is a kind of fossil fuel
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uranium is acquired by mining the lithosphere
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fossil fuels are acquired by mining the lithosphere
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to produce something can mean to form something
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a source of something emits / produces / generates / provides that something
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fossil fuels / fossils are formed from dead organisms over time
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once means one time
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if an organism is dead then that organism was living at one time
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coal is a nonrenewable resource
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to produce something means to make something
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a fossil fuel is a kind of natural resource
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coal is a kind of fossil fuel
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coal is used to produce electricity by burning in coal-fire power stations
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electricity is a kind of electrical energy
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the sun is the source of solar energy called sunlight
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coal is a nonrenewable resource
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solar energy is a renewable / inexhaustible resource
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coal is used for generating heat by burning
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to generate something means to produce something
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burning wood is used to produce heat
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a tree contains wood
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coal is used for generating heat by burning
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burning fossil fuels is a source of air pollution
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coal is used to produce electricity by burning in coal-fire power stations
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coal is a kind of fossil fuel
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burning converts chemical energy into thermal energy
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coal is used for generating heat by burning
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wood is a renewable resource
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fossil fuels are a nonrenewable resource
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renewable is the opposite of nonrenewable
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something cannot have two opposite properties
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renewable is a property of resources
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if something cannot have a certain property then something else with that property is not that something
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fossil fuels are a nonrenewable resource
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nonrenewable resources will eventually be depleted
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remains are parts of a dead organism
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an organism is a living thing
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fossil fuels / fossils are formed from dead organisms over time
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oil is used for producing electricity
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to last longer means the length of time that something lasts increases
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as the use of something decreases , the use of the source of that something will decrease
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how long something lasts is a measure of how long that something is available
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fossil fuels are a kind of energy resource
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oil is a kind of fossil fuel
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to decrease something means to reduce something
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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 the use of something decreases, the use of things used to produce that something decreases
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fuel supply is a kind of resource
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a supply of something is a source of that something
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fossil fuels are a nonrenewable resource
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if something increases something else then decreasing that something will decrease that something else
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electrical power is a kind of power
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burning something is a kind of action
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to decrease something means to reduce that something
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natural gas is used for generating electricity by burning in a power plant
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if something causes an increase in something else then that something produces that something else
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if something occurs by performing an action, then that action is required for that something to occur
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as the use of renewable resources increases , use of nonrenewable resources will decrease
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the burning of fossil fuels produces greenhouse gasses
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natural gas is a kind of fossil fuel
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electricity is a kind of electrical power
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to produce something means to form something
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a source of something emits / produces / generates / provides that something
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sulfur dioxide is formed by the combustion of fossil fuels
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geothermal energy is a renewable resource
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nevada contains many active fault lines
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energy formed by magma heating earth's crust is emitted along fault lines
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geothermal energy is formed by magma heating earth 's crust
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a source of something emits / produces / generates / provides that something
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if something contains many of something else then that something else is common in that something
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geothermal energy is a renewable resource
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if something is emitted at a location then that something can be found at that location
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geothermal energy is formed by magma heating earth 's crust
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energy formed by magma heating earth's crust is emitted along fault lines
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nevada contains many active fault lines
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metal is a nonrenewable resource
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copper is a kind of metal
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an example of heating something is heating a building
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a source of heat can be used to heat something
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