Across
- 3. Can't be replaced in a short time frame.
- 5. Restoring land to a more productive state by adding soil from another area.
- 7. Are DESIGNED to protect surrounding areas from soil and water pollution.
- 8. Human activities increase ________?
- 11. First layer of soil.
- 12. The removal of forests to use the land for other purposes.
Down
- 1. Always available or naturally replaced.
- 2. Are mined from below Earth's surface.
- 4. A renewable energy source.
- 6. Fourth layer of soil.
- 9. A nonrenewable energy source.
- 10. Bog, marsh, swamp