Biogeochemical

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Across
  1. 3. the cycle of processes by which water circulates between the Earth's oceans, atmosphere, and land
  2. 4. a nonmetallic element that is found in the blood, muscles, nerves, bones, and teeth
  3. 7. a nonmetallic element that makes up about 78 percent of the atmosphere by volume
  4. 8. the series of processes by which carbon compounds are interconverted in the environment
Down
  1. 1. a colorless, odorless, highly flammable gas
  2. 2. a nonmetallic element that makes up about 78 percent of the atmosphere by volume
  3. 5. a nonmetallic element that exists in its free form as a colorless, odorless gas and makes up about 21 percent of the Earth's atmosphere
  4. 6. carbon dioxide or other gaseous carbon compounds released into the atmosphere