Tectonic plate

1. Waves: Waves of energy that travel through the Earth as a result of an earthquake.
5. Boundary: A plate boundary where two plates move apart.
7. The point on the Earth's surface directly above the focus of an earthquake.
9. Drift: The theory that the continents were once part of a single landmass that drifted apart.
11. Molten rock that has reached the Earth's surface.
14. The upper layer of the Earth's mantle, below the lithosphere, where the rock is more fluid.
15. Boundary: A plate boundary where two plates slide past each other horizontally.
16. The point within the Earth where an earthquake rupture starts.
19. Boundary: A plate boundary where two plates collide.

2. The process where one tectonic plate slides under another.
3. Ridge: An underwater mountain range formed by plate tectonics.
4. A sudden release of energy in the Earth's crust that creates seismic waves.
6. A mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are or have been erupted from the earth's crust.
8. Boundaries: The edges of tectonic plates where most of the geological activity occurs.
10. The rigid outer part of the Earth, consisting of the crust and upper mantle.
12. Molten rock beneath the Earth's surface.
13. Plates: Large, irregularly shaped slabs of solid rock that make up the Earth's lithosphere.
16. A fracture in the Earth's crust where movement has occurred.
17. The supercontinent that existed millions of years ago, from which the present continents separated.
18. A long, narrow depression in the ocean floor, often formed at subduction zones.