Source to mouth

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Across
  1. 2. A place where a river can begin
  2. 3. A wetland with soil that is rich in minerals
  3. 4. The start of a river
  4. 5. A place in a river where water spills downward
Down
  1. 1. When water covers land that is usually dry
  2. 3. The loops and curves of a slow-moving river