Across
- 2. the process of breaking rocks down
- 4. something that satisfies a particular purpose
- 8. layer of gases above earths surface
Down
- 1. substances found in rocks
- 3. fuel obtainedfrom plants, agriculture
- 5. the removal of sediments
- 6. a form of mining which uses waterand chemicals
- 7. decaying plants and animals and their waste