Geography influences history

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Across
  1. 3. What's the largest river in the Middle East?
  2. 5. What's the largest river in Egypt?
  3. 8. What do you call a group of mountains?
  4. 9. Groups of people that lived in the Great Plains
Down
  1. 1. A liquid essential to survive?
  2. 2. What's the largest state in the USA?
  3. 4. How many were the (American) original colonies?
  4. 6. North of the Atlas Mountains there's reliable ______
  5. 7. Animals that were domesticated to travel and hunt more efficiently