Across
- 1. A mostly solid, rocky part of the Earth; extends from the center of the core to the surface of the crust
- 4. The melting or fusing of ore in order to separate impurities from pure metal
- 5. Oil deposits that are discovered and are in commercial production
- 7. Energy from sources that are constantly being formed
- 8. A mineral that contains one or more elements of economic value
- 10. A natural, usually inorganic solid that has a characteristic chemical composition, an orderly internal structure, and a characteristic set of physical properties
- 11. A liquid mixture of complex hydrocarbon compounds; used widely as a fuel source
- 12. The process or industry of obtaining coal or other minerals from the Earth.
Down
- 2. A mining method in which soil and rocks are removed to reach underlying coal or minerals
- 3. Any natural material that is used by humans, such as water, petroleum, minerals, forests, and animals
- 6. A deposit that contains a valuable mineral that has been concentrated by mechanical action
- 9. The process of returning land to its original condition after mining is completed