Across
- 3. vehicle too small for people, used for exploring deeper than a submersible
- 6. relatively flat area of the sea floor
- 12. reef growing in a circle formation, usually around a volcanic island
- 15. water from 0 to 660 feet below the surface; also known as the sunlit zone
- 16. water from 3,300 to 13,200 feet below the surface; also known as the midnight zone
- 19. mini-submarine for exploring deep in the ocean
- 20. steep drop off from continental shelf to sea floor
- 21. reef that grows from the land into the ocean
- 22. idea that the rate at which things happen today has been constant throughout history
Down
- 1. underwater mountain
- 2. water from 660 to 3,300 feet below the surface; also known as the twilight zone
- 4. water more than 13,200 feet below surface
- 5. living animals able to glow in the dark
- 7. shallow area of land sloping away from the continents
- 8. use of sound waves to measure distances in water
- 9. flat topped underwater mountain
- 10. reef forming a barrier between the ocean and land
- 11. scientist who studies the ocean
- 13. island formed by the collective growth of coral polyps
- 14. undersea explorer
- 17. deep valley in the sea floor
- 18. another name for echo sounding