Across
- 3. to look at someone in a cruel way.
- 6. the number of times a sound is produced in one second.
- 7. equipment to find out where something is underwater.
- 9. a unit of measurement of sound.
- 10. a scientist who studies sea life.
- 11. the way living things affect each other and the environment.
- 12. a mixture of two very different things.
Down
- 1. to change something to make it better.
- 2. a small device to record information about activity.
- 4. a very large area of sea.
- 5. like a human.
- 8. an animal that hunts and kills other animals for food.