Revision: People and rivers

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Across
  1. 2. These machines inside the dam help to create electricity
  2. 4. HEP stands for Hydroelectric _______
  3. 6. Another benefit of dams
  4. 7. A barrier built across a river
  5. 8. This fertile mixture is deposited by rivers
  6. 10. Dams can sometimes help with controlling this
Down
  1. 1. A big reason for dams is water _________
  2. 3. This is also needed to create a dam
  3. 5. The name of the lake behind a dam
  4. 9. Dams can cause this type of pollution
  5. 10. The ______ dams were built 3,000 years ago