Earth Science

1. the two sub-layers of the earth's crust (lithosphere) that move, float, and sometimes fracture and whose interaction causes continental drift, earthquakes, volcanoes, mountains, and oceanic trenches
2. Earth's lithosphere (the crust and upper portion of the mantle) is divided into about 12 large plates and several small ones that float on and travel independently over the asthenosphere.
6. coming closer together
7. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
8. a long high sea wave caused by an earthquake, submarine landslide, or other disturbance.
10. the movement of two oceanic plates away from each other

1. parts of the Earth's crust slowly drift atop a liquid core.
3. where two tectonic plates meet
4. make a thorough or dramatic change in the form, appearance, or character of.
5. a long narrow ditch
9. a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
11. tending to be different or develop in different directions.
12. running along the Mid-Oceanic Ridge