Constructive and Destructive waves

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Across
  1. 1. Constructive waves cause ...
  2. 2. movement of waves up the beach
  3. 5. These waves have a strong swash
  4. 7. Destructive waves cause ...
Down
  1. 1. These waves have a strong backwash
  2. 3. Constructive waves are low in what?
  3. 4. of waves down the beach backswash
  4. 6. Destructive waves are high and...