3-2 Vocab

2. A sudden shaking of the ground, sometimes causing great destruction, as result of movements within the Earth crust.
6. a Boundary in which two plates move apart.
8. Molten or semi-molten natural material from which all igneous rocks are formed.
12. a deep canyon like structure.
13. high angle of decent and deeper trenches.
14. When large ocean has formed between two continental margins and spreading still occurs.
16. less likely to subduct due to its buoyancy.
18. forms along the margin of a continent where oceanic crust subducts beneath continental crust.
19. a narrow, elongated depression of the seafloor.
20. low angle of decent and shallower trenches.

1. a boundary in which two plates slide past one another.
3. linear, long scares on seafloor, often stretching thousands of Km.
4. a hypothesis which suggested that new oceanic crust is produced at the crests of mid-ocean ridges.
5. a long, narrow ditch.
7. a boundary in which two plates move together.
9. drive plate tectonics by pulling along the lithosphere to which they attach in a process known as slab pull and by inducing currents in the mantle.
10. elevated area of the seafloor characterized by high heat flow and volcanism.
11. a chain box volcanic islands generally located a few hundred Km from a trench.
15. Vast, submarine regions that collectively cover a significant portion of Earth’s surface and contain the majority of the planets water.
17. to gain enough kinetic energy to overcome intermolecular forces.