Earth's Moving Crust

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Across
  1. 5. A mid-ocean chain of undersea mountains that circle the Earth like the seam of a baseball.
  2. 8. A type of touch volcanic rock that makes up most of the ocean's basins, mid-ocean ridges, and plates.
  3. 10. A crack in the Earth's surface between two divergent plates.
  4. 11. The study of the structure of the Earth's surface.
  5. 12. A mountain peak on the ocean floor that does not reach the surface of the water.
Down
  1. 1. Plate movement when two plates move away from each other.
  2. 2. Hot, molten rock deep below the Earth's surface.
  3. 3. Plate movement when two plates move toward each other.
  4. 4. The layer of the Earth between the crust and the core
  5. 6. The bottom or floor of the ocean.
  6. 7. Huge rock slabs that form the Earth's crust
  7. 9. The bottom of the deep ocean below the continental shelf, usually deeper than 13,000 feet.