Tectonic Plates

1. the solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle
4. The amount of matter in a given space or volume; oceanic crust is thinner, but denser than continental crust.
6. The thin and solid outermost layer of the Earth above the mantle
10. boundaries when two tectonic plates slide past each other
12. Occurs when two tectonic plates move toward each other and collide.
13. Occurs when two tectonic plates move away from each other.
14. Dense plate composed of iron-rich basalt rocks.
16. The place where two different plates have contact.
18. term for the super continent which contained all the plates together
19. Huge pieces of lithosphere that slowly move on the asthenosphere and consist of the crust and the rigid, uppermost part of the mantle.

2. Molten rock spews out from the mantle to the surface of Earth as ash, lava, and gases. Major geological events that occur when a dense plate subducts below a less dense plate.
3. Are natural features of the landscape, natural physical features of the earth's surface
5. Major geological events that occur when plates shift suddenly and release stored energy; a frequent occurrence along all types of plate boundaries
7. is the layer of the upper mantle composed of low-density rock material that is semi plastic.
8. one plate is denser then another and is forced below as the two plates converge at their boundary.
9. Less dense plate, composed of silica-rich granite rocks.
11. underwater chain of mountains.
15. Proposed the continental drift theory in the 1900s
17. the process by which Earth's crust breaks apart; can occur within continental crust or oceanic crust