Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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natural gas a mixture of gases found in the earth's crust. Natural gas is burned as cooking and heating fuel.
natural history the study of plants, animals, rocks, land forms, and other objects in nature or the physical world.
natural resources materials that are found in nature and that can be used by people in many ways. Fresh water, soil, coal, and forests are all examples of natural resources.