Plate Motion

2. An underwater mountain chain where new ocean floor is formed as two tectonic plates pull away from each other.
3. The theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core.
5. The very hot center of the Earth, consisting of a solid inner core and a liquid outer core.
8. Large pieces of the Earth's lithosphere that move and interact with one another.
11. A fracture along which rocks on either side have moved relative to each other.
12. A plate boundary where two tectonic plates slide past each other horizontally.
15. An instrument used to measure and record earthquakes.
16. The shaking and trembling that results from movement of rock beneath Earth's surface.
17. Molten rock beneath the Earth's surface that forms igneous rock when it cools.

1. A plate boundary where two tectonic plates move away from each other, often leading to the formation of new crust.
4. An area where one tectonic plate is being forced down into the mantle beneath another plate.
6. Molten rock that flows out of a volcano during an eruption.
7. A natural feature of the Earth's surface, like a mountain, valley, or plain.
9. A plate boundary where two tectonic plates move toward each other, leading to collisions.
10. A mountain that opens downward to a pool of molten rock below the surface of the Earth.
13. The layer of rock between the Earth's crust and core.
14. The gradual movement of the continents across Earth's surface through geological time.