Ocean Currents

2. a force that pulls downward.
3. plain, a large area of extremely flat or gently sloping ocean floor just offshore from a continent, at depths of 13,000-20,000 feet.
4. slope, the slope between the outer edge of the continental shelf and the deep ocean floor.
7. vent, a fissure in a planet's surface from which geothermally heated water is released.
9. the movement of fluid.
10. island, formed by a build up of cooled lava, breaks the surface of the ocean.
12. shelf, the area of seabed around a large landmass where the sea is relatively shallow compared with the open ocean.

1. the temperature and salt content of water.
5. the regular rise and fall of ocean levels.
6. things that can flow like gases.
8. ridge, an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
11. trench, a long, narrow, deep depression in the ocean floor, typically one running parallel to a plate boundary and marking a subduction zone.