Geography 'Coast' Crossword

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Across
  1. 5. Desert hills found by the sea (4,5)
  2. 9. Power from water breaking rock (9,6)
  3. 10. Steep drop (5)
  4. 11. Breaking down rock by reactions (8,11)
Down
  1. 1. Hard to wear down (9)
  2. 2. Distance between crests (4,6)
  3. 3. Tough methods controlling the coast (4,11)
  4. 4. Dissolving answer found in the sea (8)
  5. 6. Mass movement when land decides to move (9)
  6. 7. Sandy shore (5)
  7. 8. Easily worn away - stone (4,4)