Environmental Engineering

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Across
  1. 2. relating to, involving, or requiring free oxygen
  2. 5. avoiding the depletion of natural resources in order to maintain an ecological balance
  3. 6. scattered pieces of rubbish or remains
  4. 7. the tendency of a body to float or to rise when submerged in a fluid
  5. 10. the process of cleaning something, especially with a chemical, in order to destroy bacteria
  6. 11. liquid waste or sewage discharged into a river or the sea
Down
  1. 1. allow (a liquid, gas, or other substance) to flow out from where it has been confined
  2. 3. water that is safe to drink or to use for food
  3. 4. in short supply; shortage
  4. 8. the disposal of waste material by burying it, especially as a method of filling in and reclaiming excavated pits
  5. 9. whirls in the ocean