crossword revision

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Across
  1. 2. it can remove material from the beach and are frequent in numer between 10-15 a minute
  2. 4. they have a weak swash and a strong backwash and they are usually big
  3. 6. when water goes into a crack freezes and expands breaking part of the rock off
  4. 7. when material is transported to a different place
  5. 8. they have a strong swash and a weak backwash and are usually small
  6. 11. when wind , water and natural things erode land
Down
  1. 1. the distance of water the wind has to travel through to get to a coast
  2. 2. when plants or insects break through concrete
  3. 3. when a wave breaks and the water goes up the beach putting material on it
  4. 5. after material is transported it is left on the beach or in the sea/river
  5. 9. when heat expands the rock and cold contracts it making the top layer slowly peel off
  6. 10. the flow of water in a certain direction