Plate Tectonics!

2. is a large landmass.
5. The layer of rock that forms Earth’s outer surface.
9. crust is a layer of igneous, sedimentary, and metamorphic rocks.
10. ridge An undersea mountain chain where new ocean floor is produced; a divergent plate boundary.
11. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
12. The preserved remains or traces of an organism that lived in the past.
13. A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.
15. trench A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.

1. A break in Earth’s crust along which rocks move.
2. currents The movement of a fluid, caused by difference in temperature, that transfers heat from one part of the fluid to another.
3. valley A deep valley that forms where two plates move apart.
4. The name of the single landmass that began to break apart 200 million years ago and gave rise to today’s continents.
6. waves is a mechanical vibration.
7. boundary A plate boundary where two plates move past each other in opposite directions.
8. spreading The process by which molten material adds new oceanic crust to the ocean floor.
9. boundary A plate boundary where two plates move toward each other.
14. is the point or line where one region ends and another begins.
15. boundary A plate boundary where two plates move away from each other.