Geography

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Across
  1. 3. unicellular or multicellular organisms, seaweed
  2. 4. a source of energy that is not is not depleted by use
  3. 5. Trustworthy
  4. 8. something that is supplied by nature
  5. 9. take out
  6. 11. a structure built across a river to control the river's flow
  7. 12. removing the dissolved salt from ocean water
  8. 13. layer of rock
  9. 15. Get large for
  10. 17. impure by exposure to or addition of a polluting substance
  11. 18. concentrated seawater by-product
Down
  1. 1. deep holes
  2. 2. a lake
  3. 3. impure by exposure to or addition of a polluting substance
  4. 6. supply dry land with water by means of streams; water artificially
  5. 7. the waste matter that passes through drains
  6. 9. a system formed by the interaction of a community of organisms with its environment
  7. 10. to remove the salt and turn seawater into fresh water for drinking
  8. 11. a long period of time without rainfall
  9. 14. Long term plans
  10. 16. poisonous substances