Shaped in tide pools

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Across
  1. 2. A shape that has 3 sides and 3 angles
  2. 4. A type of clam that has a black, brown, or purple shell
  3. 6. The hard cover on the outside of an animal
  4. 7. A sea animal that has a shell and 10 legs
  5. 9. The outlines of something like a square
  6. 11. An animals body part that is used to hold things
Down
  1. 1. A pool of water that is on the shore after the tide gets lower
  2. 3. A number of people or things that are gathered together
  3. 5. The land on the edge of the water
  4. 6. A sea animal that is shaped like a star
  5. 8. A rounded shape like an egg
  6. 10. A small animal with a shell that looks like a spiral or triangle