Earth's Environmental Systems

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Across
  1. 2. An overgrowth of algae and other producers
  2. 3. An organism that produces its own food
  3. 5. Matter that organisms need to live
  4. 9. Fresh water found underground
  5. 13. The process by which organisms use oxygen to release the energy in food and carbon dioxide and water
  6. 16. A thin layer of relatively cool rock that forms Earth’s outer skin both on dry land and in the ocean
  7. 18. A layer of very hot but mostly solid rock below the crust
  8. 19. The depositing of eroded soil at a new location
  9. 20. A change in state from a gas to a liquid
  10. 21. A large section of lithosphere that moves over Earth’s surface
Down
  1. 1. The conversion of a substance from a liquid to a gas
  2. 4. The conversion of nitrogen gas into ammonia, which makes nitrogen gas usable for organisms
  3. 6. A mountain, island, continent, or other feature that forms above and beneath the ocean’s surface
  4. 7. The process by which producers use carbon dioxide, water, and sunlight to make their own food
  5. 8. A complex cycle in which nutrients continuously circulate through the environment
  6. 10. The release of water vapor through the leaves of plants
  7. 11. The part of Earth beneath the mantle; Earth’s center
  8. 12. An organism that breaks down wastes and dead organisms
  9. 14. A layer of rock and soil that holds water underground
  10. 15. Water that returns from the atmosphere to Earth’s surface
  11. 17. An organism that must eat other organisms to get nutrients