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any natural material that is used by humans, such as water, petroleum, minerals, forests and animals
a natural resource that can be replaced at the same rate at which the resource is consumed
a resource that forms at a rate that is much slower than the rate at which it is consumed
the process of recovering valuable or useful materials from waste or scrap; the process of reusing some items
a nonrenewable energy resource formed from the remains of organisms that lived long ago; examples include oil, coal, and natural gas
a mixture of gaseous hydrocarbons located under the surface of the Earth, often near petroleum deposits; used as a fuel
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