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2. This is a form of ground water pollution where heavier chemicals fall back to the ground and coat the trees and leaves of plants. (1 point)
3. This is a process by which water is brought into the water table to replace water that has been taken out through wells. (1 point)
4. This is the upper limit of usable ground water. (1 point)
5. This percentage of all water on the planet is salt water. (1 point)
6. This percentage of water on earth is fresh water used for drinking. (1 point)
7. Much of this is frozen glaciers and ice caps, so we don’t consider it usable. (1 point)
8. Water evaporates from the surface into the sky and back down to the earth as what? (1 point)
9. Aquifers are deep _________ rivers or caves that filter and store fresh water. (1 point)
10. Currently, new regulations control the use of pesticides and chemical fertilizers to reduce what? (1 point)