Topic 10 Plate Tectinics

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Across
  1. 3. trench An undersea valley that represents one of the deepest parts of the ocean.
  2. 5. An area where magma from deep within the mantle melts through the crust above it
  3. 7. A force that acts on a rock to change its shape or volume
  4. 10. A term used to describe a volcano that is not currently active but able to become active in the future
  5. 13. The shaking that results from the movement of rock beneath Earth's surface.
  6. 14. A plate boundary where two plates move past each other in opposite directions
  7. 15. A term used to describe a volcano that is no longer active and unlikely to erupt again.
  8. 17. stress that pushes masses of rock in opposite directions, in a sideways movement
  9. 19. A molten mixture of rock-forming substances, gases, and water from the mantle
  10. 20. A weak spot in the crust where magma has come to the surface
  11. 21. An undersea mountain chain where new ocean floor is produced; a divergent plate boundary under the ocean.
Down
  1. 1. A plate boundary where two plates move away from each other.
  2. 2. Stress that stretches rock so that it becomes thinner in the middle
  3. 4. A plate boundary where two plates move toward each other.
  4. 6. Stress that squeezes rock until it folds or breaks
  5. 8. A break in the Earth's crust
  6. 9. liquid magma that reaches the surface
  7. 11. A giant wave usually caused by an earthquake beneath the ocean floor.
  8. 12. The process by which molten material adds new oceanic crust to the ocean floor
  9. 16. The sinking, movement of the ocean floor back into the mantle
  10. 18. The measurement of an earthquake's strength based on seismic waves and movement along faults.