Constructive and Destructive waves

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Across
  1. 4. Destructive waves cause this process
  2. 5. Destructive waves are high and...
  3. 6. Water washed up the beach
  4. 8. These waves have a stronger backwash
Down
  1. 1. Water washed down the beach
  2. 2. Constructive waves cause this process
  3. 3. These waves have a stronger swash
  4. 7. Constructive waves are low in what?