Tectonic Plates

5. Outermost layer of the Earth.
7. The lowest layer of the mantle.
9. Boundary The boundary between two plates that move away from each other.
12. Floor Spreading The process by which new oceanic crust forms along a mid- ocean ridge and older oceanic crust moves away from the ridge.
13. The bending of rock layers.
16. Boundary The boundary between two plates that slide past each other.
17. Boundary The boundary between two plates that move toward each other.
18. The rigid outermost layer of the Earth that includes the uppermost mantle and crust.
19. A pulling force.

1. Vibrations caused by the rupture and sudden movement of rocks along a break or crack in the Earth's crust.
2. the process that occurs when one tectonic plate moves under another tectonic plate.
3. The partially melted portion of the mantle below the lithosphere.
4. Currents The movement of fluids in a cycle because of convection.
6. Drift Wegener's hypothesis which suggested that the continents are in constant motion on Earth's surface.
8. A squeezing force.
10. Core Solid dense center of the Earth
11. a crack or fracture in Earth's lithosphere along which movement occurs.
14. Core Liquid layer of the Earth's core
15. Layer between the crust and the core.