Across
- 1. Ocean Ridge A line of underwater mountains in the middle of the ocean.
- 2. A crack in the lithosphere
- 6. The measure of an earthquake’s strength.
- 7. Spot A region of volcanic activity in the middle of a plate.
- 9. Drift Wegener’s theory that a supercontinent split apart and the pieces drifted to their present location.
- 11. A shaking of the ground.
- 13. tectonics Earth’s surface is made of plates that move slowly across the mantle.
- 15. Molten rock in the mantle.
- 17. magma on the Earth’s surface.
- 19. The point on Earth's Surface just above the focus.
- 20. one plate sinking beneath another.
Down
- 1. amount of energy released in an earthquake.
- 3. Andreas Fault The boundary between the north American and pacific plates.
- 4. Wave A vibration that travels through Earth.
- 5. Scale A way to measure the magnitude of an earthquake.
- 8. Trench A long, deep undersea valley.
- 10. Scale A way to measure the intensity of an earthquake.
- 12. Cycle The process by which one kind of rock is changed into another.
- 14. rocks in the rust attached to the upper mantle.
- 16. the point below Earth's surface where an earthquake occurred.
- 18. A crack in the crust through which magma flows.