Sea crossword #2 (level 3)

Across

5. 5 Tower that guides ships at night. (10 letters)
8. 8 You pick it up on the beach. (5 letters)
11. 11 Explores the bottom of the sea. (5 letters)
12. 12 White bird of the seaside. (7 letters)

Down

1. 1 The sea goes up and down every day. (4 letters)
2. 2 The biggest animal in the world. (5 letters)
3. 3 It floats and sails. (4 letters)
4. 4 See-through animal that stings. (9 letters)
6. 6 Land surrounded by water. (6 letters)
7. 7 It has eight arms. (7 letters)
9. 9 It forms colorful reefs. (5 letters)
10. 10 It walks sideways. (4 letters)