Liz Heitkamp D1-3

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