Human Impact on Earth's Systems

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Across
  1. 3. materials or substances such as minerals, forests, water, and fertile land that occur in nature and are necessary or useful to humans.
  2. 4. all the water on Earth
  3. 5. the removal of trees faster than forests can replace themselves.
  4. 7. the layers of gases surrounding Earth
  5. 8. consists of all living things on Earth
  6. 9. gases in Earth's atmosphere that trap heat near the surface.
  7. 10. practices that meets current needs without compromising the ability of future generations to meet their own needs.
  8. 11. release of harmful materials into the environment
  9. 13. a natural resource that is replenished by natural processes at a rate comparable to its rate of consumption.
  10. 15. a substance that provides nutrients to help crops grow better.
  11. 16. chemicals used on plants that do not harm the plants, but kill pests and have negative impact on other species.
Down
  1. 1. a resource that will not return, or renew, or will only return after a long period of time.
  2. 2. coal, oil, natural gas, and other fuels that are ancient remains of plants and animals.
  3. 6. capturing fish faster than they can reproduce.
  4. 9. natural situation in which heat is trapped in Earth's atmosphere by carbon dioxide, methane, and other gases.
  5. 12. prevention of wasteful use or protection of natural resources.
  6. 14. the mostly solid, rocky part of the Earth; extends from the center of the core to the surface of the crust.