Across
- 6. A crack in the earth's crust
- 7. Extracting minerals from the ground
- 9. The decomposition of plant remains
- 11. Fuel that comes from plants and animals
- 14. The act of cutting down trees and causing erosion
- 16. An igneous rock layer that forms when magma hardens on the earth&g
- 17. movement of people from urban areas to cities
- 19. Farming
- 20. How light reflects off a mineral
Down
- 1. Constructing a man-made habitat
- 2. Going inside the earth in the hope of finding petroleum
- 3. Reduce the s amount of damage from mining
- 4. Mineral's ability to split
- 5. A spontaneous process in which unstable nuclei lose energy
- 8. A principle that states the younger rock lies on top of older rock
- 10. Naturally occurring substance
- 12. The color of a mineral in powder form
- 13. A shift from farming to factories in an economy
- 15. Mineral's ability to split along a jagged surface
- 18. A machine that produces power