CH 3 Vocabulary

6. the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
7. type of plate boundary where two plates slide past each other
8. shaped like a ball, with all points on the surface at an equal distance from the center
11. a force that every object exerts on every other object because of their masses
13. type of plate boundary where two plates are moving apart, magma comes up to create new crust
14. Earth's brittle, rocky outer layer
15. type of plate boundary where plates move toward one another and collide
16. the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
17. the dense metallic center of Earth

1. the process that creates new sea floor as plates move away from each other at the mid-ocean ridges
2. part of the mantle; plastic-like layer (able to flow)
3. crust and uppermost mantle grouped together into a rigid, or hard, layer
4. the mountain ranges in the middle of the oceans
5. a supercontinent containing all of Earth's land that existed about 225 million years ago.
9. a theory stating that the earth's surface is broken into plates that move.
10. the circulation of material caused by differences in temperature and density
12. thick middle layer in the solid part of Earth