Tectonic Plates

2. a pulling force
4. spreading magma creates new rock in ocean
7. a region where an oceanic plate sinks down into the asthenosphere
10. a break in the Earth's crust
11. A usually light-colored rock that is found in continental crust
12. boundary between two plates moving away from each other
14. core A dense sphere of solid iron and nickel in the center of Earth
15. drift The hypothesis that the continents slowly move across the Earth's surface
16. The layer of hot, solid material between Earth's crust and core
17. the bending of rock layers
19. A rigid layer made up of the uppermost part of the mangle and the crust
21. boundary between two colliding plates

1. A dark, dense, igneous rock with a find texture, found in oceanic crust
2. boundary boundary between two plates that are sliding past each other
3. a squeezing force
5. Great landmasses surrounded by oceans
6. where two plates meet
8. The soft layer of the mantle on which the lithosphere forms
9. hypothetical supercontinent that included all current land masses
13. plates the two sub-layers of the earth's crust that move, float, and sometimes fracture and whose interaction causes continental drift, earthquakes, volcanoes, mountains, and oceanic trenches
18. The layer of rock that forms the Earth's outer surface
20. core A layer of molten iron and nickel that surrounds the inner core of Earth