Carbon Cycles, Changing Ecosystems

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Across
  1. 1. living things and their environment in one area
  2. 4. ground that stays frozen all year
  3. 7. blanket of air that surrounds Earth
  4. 9. rotting of dead plants and animals that releases carbon
  5. 11. long term change in Earths temperature and weather
  6. 13. process plants use to turn sunlight and carbon dioxide into food
  7. 14. system of who eats whom in an ecosystem
  8. 18. gas we breathe out and plants use
  9. 19. large body of salt water that takes in carbon dioxide from the air
  10. 20. animal that eats plants or other animals
Down
  1. 2. element found in all living things
  2. 3. gas made in swamps and in animal guts
  3. 5. process where living things use oxygen and give off carbon dioxide
  4. 6. cutting down trees in a forest
  5. 8. burning of fuels that puts carbon dioxide into the air
  6. 10. partly rotted plant material in wet ground
  7. 12. plant that makes its own food
  8. 15. warming of Earth when gases trap heat
  9. 16. coal oil and gas made from ancient plants and animals
  10. 17. total amount of living matter in an area