Seaside

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Across
  1. 2. ridges moving along the surface of the sea
  2. 4. hard outer covering of an animal
  3. 5. fake fortified building
  4. 8. seabird with long wings
Down
  1. 1. grey smooth round stones
  2. 3. jelly body and stinging tentacles
  3. 4. tiny gold grains
  4. 5. meets sea at the end of the horizon
  5. 6. colourless liquid
  6. 7. yellow star that glows