Geography puzzle

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Across
  1. 2. sides of the river
  2. 5. the steepest part of the river
  3. 6. where the river ends
  4. 10. where the slope flattens out
  5. 13. when the river picks up material from a place
  6. 14. the rocks and stones knock against and wear each other off
  7. 16. the smaller rivers that join the main one
  8. 17. the area of land that feed that river with water
  9. 19. the route in which the river flows
  10. 20. when liquid water changes into water vapor
  11. 21. when the drops the material somewhere
Down
  1. 1. when water is forced into the cracks in the banks
  2. 3. when small light particles of rock and soil are carried along by the water
  3. 4. when water drops fall to the ground
  4. 7. when the river carries the material to another place
  5. 8. the deposited material
  6. 9. an imaginary line that seperates one drainage basin from the next
  7. 11. where two rivers join
  8. 12. bottom of the river
  9. 15. when sand ans stones scrape the bed and banks
  10. 18. the starting point of a river