Earthquakes and Volcanoes

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Across
  1. 3. A deep valley where two plates move apart
  2. 5. a break or crack in the earth's lithosphere
  3. 7. A rigid layer made up of the uppermost part of the mantle and the crust
  4. 8. Cause the plates to move; between the lithosphere and the asthenosphere
  5. 10. thickest layer of the earth
  6. 12. A plate boundary where two plates move toward each other
  7. 14. Single landmass that broke apart 250 million years ago
  8. 15. A layer of molten iron and nickel that surrounds the inner core of the Earth
Down
  1. 1. A plate boundary where two plates move away from each other
  2. 2. A plate boundary where two plates grind against each other, moving in different directions
  3. 4. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
  4. 6. The layer of rock that forms the Earth's outer surface
  5. 9. A soft layer of the mantle on which the lithosphere floats
  6. 11. a deep canyon on the ocean floor
  7. 13. Dense ball of solid material at the center of the Earth