Geography

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Across
  1. 2. : rocks used to protect coastal lines.
  2. 6. waves : waves that build land.
  3. 8. : when a stack falls.
  4. 9. : start the whole process
Down
  1. 1. : powerful waves
  2. 3. : you can walk on it or through it
  3. 4. : used to keep water away but is bad looking
  4. 5. waves : waves that destroy land.
  5. 6. : when cracks open up.
  6. 7. wall : wall used to keep water out of land and cities.