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Multi-word Results
| 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. |
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