Answer:

1. Starfish (Star and fish)

2. Seahorse (Sea and horse)

3. Shipwreck (Ship and wreck)

4. Driftwood (Drift and wood)

5. Seabed (Sea and bed)

6. jellyfish (jelly and fish)

7. Seaweed (Sea and weed)

8. Underwater (Under and water)

9. Seashell (Sea and shell)

10. Stingray (Sting and ray)