The geography of ancient Egypt

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Across
  1. 2. Which river's floods were predictable and happened every summer?
  2. 4. An area where a river fans out into various branches as it flows into a body of water
  3. 6. rock formations that create churning rapids
Down
  1. 1. The only major resource Egypt lacked
  2. 3. Without it there could be no agriculture in Egypt’s desert.
  3. 5. a key to the development of Egyptian civilization