Cycles of Matter

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Across
  1. 4. water evaporating from plants
  2. 5. the gas form of carbon found in our atmosphere
  3. 7. flows; powers the cycles of matter
  4. 9. potentially harmful human product that introduces lots of nitrogen to the environment
  5. 13. responsible for turning nitrogen into a solid chemical
  6. 14. When too much N or P causes rapid growth of algae in water systems.
  7. 16. contains nitrogen; found in proteins
Down
  1. 1. water changing from gas to liquid
  2. 2. the type of cycles where chemicals transfer between living things and their environment
  3. 3. 78% of the air we breathe is made from this
  4. 6. the stuff everything is made from; cycles
  5. 8. the study of the relationship between living things and their environment
  6. 10. water changing from liquid to gas
  7. 11. contains nitrogen; includes DNA
  8. 12. One of the ways animals return nitrogen to the ground
  9. 15. Plants absorb nitrogen from the soil and bacteria using their _______.