Carbon cycle

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Across
  1. 3. chemical element with the symbol C, which forms the basis of all known life.
  2. 6. large body of salt water that covers most of the Earth.
  3. 7. layers of gases surrounding a planet or other celestial body.
  4. 9. living or once-living thing.
  5. 10. breathing.
Down
  1. 1. process by which plants turn water, sunlight, and carbon dioxide into water, oxygen, and simple sugars.
  2. 2. cycle series of processes in which carbon (C) atoms circulate through Earth's land, ocean, atmosphere, and interior.
  3. 4. remnant, impression, or trace of an ancient organism.
  4. 5. large, concentrated supply or reserve.
  5. 8. having to do with the ocean.