Across
- 2. floor spreading The idea that new crust is forming at ridges in the sea floor, spreading apart the crust on either side of the ridges.
- 4. The layer beneath Earth's crust.
- 5. The point where an earthquake starts as rock begin to slide past each other.
- 7. Earth's solid, rocky surface containing the continents and ocean floor.
- 9. A huge crack in Earth's crust at or below the surface, the slides of which may show evidence of motions.
Down
- 1. Hot, molten rock below Earth's surface.
- 2. The sliding of a denser ocean plates under another plate when they collide.
- 3. tectonics The idea that Earth's surface is broken into plates that slide slowly across the mantle.
- 6. horizontality The idea that many kind of rock form flat, horizontal layer.
- 8. drift The idea that a supercontinent split apart into pieces the continents, which drift in time to their present location.