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Natural Resource
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Any natural material that is used by humans, such as water, petroleum, minerals, forests and animals
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Renewable Resource
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A natural resource that can be replaced at the same rate at which the resource is consumed.
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Nonrenewable Resource
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A resource that forms at a rate that is much slower than the rate at which the resource is consumed.
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Recycling
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The process or recovering valuable or useful materials from waste or scrap; the process of reusing some items.
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Fossil fuel
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A nonrenewable energy resource formed from the remains of organisms that lived long ago; examples include oil, coal, and natural gas.
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Petroleum
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A liquid mixture of complex hydrocarbon compounds; used widely as a fuel source
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Natural Gas
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A mixture of gaseous hydrocarbons located under the surface of the Earth, often near petroleum deposits; used as a fuel
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Coal
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A fossil fuel that forms underground
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Acid Precipitation
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Rain, sleet, or snow that contains a high concentration of acids
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Smog
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Photochemical haze that forms when sunlight acts on industrial pollutants and burning fuels
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Nuclear Energy
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The energy released by a fission or fusion reaction; the binding energy of the atomic nucleus
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Chemical Energy
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The energy released when a chemical compound reacts to produce new compounds
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Solar Energy
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The energy received by Earth from the sun in the form of radiation
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Wind Power
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The use of a windmill to drive an electric generator
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Hydroelectric energy
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Electrical energy produced by the flow of water
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