Across
- 3. Used to describe the cleanliness of a water system
- 4. aquifer covered by impermeable rock
- 7. precipitation with acidic chemicals
- 9. Pollution that can be traced to a specific source
- 10. something that allows liquid to run through it
- 13. gases in the earth's atmosphere that trap heat.
- 14. any substance that negatively affects environments
Down
- 1. the variety of life in an environment
- 2. An underground rock layer that stores water
- 5. species that give early signals of changes in an ecosystem
- 6. microscopic living organisms that have only one cell
- 8. a rock with small gaps
- 11. precipitation that does not soak into the soil but moves on the Earth's surface
- 12. a deep hole drilled into an aquifer
- 14. the measure of how acidic or basic a substance is