Oskar's river crossword

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Across
  1. 2. The ridges around the land which a river flows.
  2. 4. A mini river or a stream which feeds water to the main river.
  3. 7. The course of a normal river.
  4. 10. Material being moved from a place to another place.
  5. 11. Where material gets deposited to build new landforms.
Down
  1. 1. The bottom of the river channel.
  2. 3. The beginning of a river.
  3. 5. The side of a river channel.
  4. 6. The area drained by the river system.
  5. 8. The material getting moved somewhere through a river.
  6. 9. Where a river ends and joins the sea or ocean.