Coasts crossword

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Across
  1. 1. Expensive man made structures built to protect the coast
  2. 4. When the force of the water breaks up rocks
  3. 5. The movement of water down the beach under the force of gravity
  4. 7. An example of a stack
  5. 8. Rocks hit into each other getting smoother and smaller
  6. 9. The movement of water up the beach at an angle
  7. 10. The sandpapering of the cliff
  8. 11. Material dissolved from rocks
  9. 12. The length of water the wind blows over
Down
  1. 1. When hard rock remains left behind
  2. 2. When the sea loses energy and drops beach material
  3. 3. Curved structures at the back of beaches reflecting the waves
  4. 6. Adding sand or shingle to a beach to protect from erosion