Across
- 3. plate boundary where two plates move away from each other.
- 7. hypothesis that the continents slowly move across Earth's surface.
- 8. force that slowly wears away mountains and other features on the surface of Earth.
- 10. rigid layer made up of the uppermost part of the mantle and the crust.
Down
- 1. plastic-like layer on the mantle on which the lithosphere floats.
- 2. force that builds up mountains and landmasses on Earth's surface.
- 4. deep valley along the ocean floor through which oceanic crust slowly sinks towards the mantle.
- 5. outermost layer
- 6. shaking that results from the movement of rock beneath Earth's surface.
- 9. vibration that travels through Earth carrying the energy released during an earthquake.