Carbon and Oxygen Cycle

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Across
  1. 5. This does a lot to remove excess carbon from the atmosphere. (2 words)
  2. 8. Burning these release lots of carbon into the air. (2 words)
  3. 13. Most oxygen in the body is in the form of what?
  4. 15. Plants use this to make energy and grow.
  5. 16. Process that take carbon out of the atmosphere. (2 words)
  6. 17. When animals die, they do this.
Down
  1. 1. These are the main creators of oxygen in the atmosphere.
  2. 2. ___ is constantly taking carbon out of the atmosphere.
  3. 3. One of the biggest sources of oxygen.
  4. 4. Cutting these down reduces the amount of plants available to remove carbon from the air.
  5. 6. Another term for breathing.
  6. 7. Also known as burning, which consumes oxygen and produces carbon.
  7. 9. Other sources of oxygen production other than plants.
  8. 10. Processes that add more carbon to the air.
  9. 11. Animals are often called ____ life forms. (2 words)
  10. 12. Makes up about 65% of the mass of the human body.
  11. 13. Carbon is needed in the atmosphere because it helps to keep the Earth ____.
  12. 14. Process also called oxidation
  13. 16. Element that makes up about 18% of the human body.