Oceans

2. a specially designed vehicle used to explore the ocean
6. a wave that collapses on shore
9. underwater mountain chains that mark the boundaries where tectonic plates are spreading apart. New crust is formed
11. a stream of water or air moving in a definite direction
12. where an ocean plate collide with and slips beneath a continental plate
13. a flat area covered with sediment in the deepest parts of the ocean floor
15. organisms that live on the bottom in a body of water
17. a series of large waves triggered by an underwater earthquake, landslide, or volcanic eruption
18. marine organisms that are strong swimmers
19. an opening in the Earth's crust that allows hot water and steam to travel from the Earth's interior surface

1. regular rise and fall of the ocean surface
3. a technology that uses sound waves underwater to map the ocean floor
4. a deep ocean canyon that marks the tectonic plate
5. organisms that are very weak swimmers or that cannot swim
7. a shallow underwater extension of a continent
8. an area where saltwater and freshwater mix
10. a large underwater structure made from calcium carbonate secreted by corals
14. rolling waves
16. a measure of the amount of salt dissolved in a liquid