Topic 10 Plate Tectinics

2. A plate boundary where two plates move toward each other.
3. A giant wave usually caused by an earthquake beneath the ocean floor.
5. An area where magma from deep within the mantle melts through the crust above it
7. liquid magma that reaches the surface
8. A plate boundary where two plates move away from each other.
9. An undersea mountain chain where new ocean floor is produced; a divergent plate boundary under the ocean.
12. trench An undersea valley that represents one of the deepest parts of the ocean.
13. A plate boundary where two plates move past each other in opposite directions
15. A force that acts on a rock to change its shape or volume
17. Stress that stretches rock so that it becomes thinner in the middle
19. The shaking that results from the movement of rock beneath Earth's surface.
20. The measurement of an earthquake's strength based on seismic waves and movement along faults.

1. The process by which molten material adds new oceanic crust to the ocean floor
4. The sinking, movement of the ocean floor back into the mantle
6. A weak spot in the crust where magma has come to the surface
10. Stress that squeezes rock until it folds or breaks
11. A molten mixture of rock-forming substances, gases, and water from the mantle
14. A term used to describe a volcano that is not currently active but able to become active in the future
15. stress that pushes masses of rock in opposite directions, in a sideways movement
16. A term used to describe a volcano that is no longer active and unlikely to erupt again.
18. A break in the Earth's crust