Coasts and rivers crossword

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Across
  1. 3. The course of the river where you have mainly vertical erosion (5)
  2. 7. A type of delta (7)
  3. 9. Layers within rock (6)
  4. 12. The boundary dividing one drainage basin from another (9)
  5. 13. The finest particle size (4)
  6. 15. The movement of sediment along a beach (9,5)
  7. 16. Water moving vertically through soil (12)
  8. 17. The key term for when sediment is 'picked up' by water (11)
Down
  1. 1. A long finger of sand sticking out from coastline (4)
  2. 2. A wave with a stronger swash than backwash (12)
  3. 4. A type of erosion where rocks grate against the river bank like sandpaper (8)
  4. 5. A physical cause of flooding (9,4)
  5. 6. The movement of water back down the beach due to gravity (8)
  6. 8. An indentation at the base of the cliff (4-3,5)
  7. 10. How the heaviest particles are transported in water (8)
  8. 11. A method of hard engineering (8)
  9. 14. Fertile material deposited by rivers (8)