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| Any Natural material that is used by humans, such as water, petroleum, minerals, forests, and animals. |
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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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| A resource that forms at a rate that is much slower than the rate at which it is consumed. |
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| The process of recovering valuable or useful materials from waste or scrap; the process of reusing some items. |
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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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| A liquid mixture of complex hydrocarbon compounds; used widely as a fuel source. |
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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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| A fossil fuel that forms underground from partially decomposed plant material. |
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| Precipitation, such as rain, sleet, or snow, that contains a high concentration of acids, often because of the pollution of the atmosphere. |
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| Photochemical haze that forms when sunlight acts on industrial pollutants and burning fuels. |
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| The energy released by a fission or fusion reaction; the binding energy of the atomic nucleus. |
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| The energy released when a chemical compound reacts to produce new compounds. |
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| The energy received by the Earth from the sun in the form of radiation. |
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| The use of a windmill to drive an electric generator. |
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| Electrical energy produced by falling water. |
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| Organic matter that can be a source of energy. |
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| A mixture of gasoline and alcohol that is used as a fuel. |
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