Across
- 4. precipiation that has Ph less than 5.6
- 7. electricity produced by flowing water
- 9. Resources that can be replaced by natural processes in a relatively short amount of time
- 11. Energy released from atomic
- 12. thermal energy from earth's interior
- 13. deposits of minerals that are large enough to be mined for a profit
Down
- 1. a brownish haze produced when nitrogen compounds and other pollutants in the air react in the presence of sunlight
- 2. Resouces that are used faster than they can be replaced by natural process
- 3. a group of wind turbines that produce electricity
- 5. a process in which mined land must be recovered with soil and replanted in vegetation
- 6. cutting of large areas of forests for human activity
- 8. energy produced by burining organic matter
- 10. energy from the sun