Plate Tectonics

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Across
  1. 1. supercontinent formed 300 million years ago
  2. 9. the continents have moved over earth’s surface
  3. 12. theory of the slow, constant motion of Earth’s plates
  4. 13. seperating plates
  5. 14. 3,000 meters of hot, solid rock
  6. 16. higher density crust sinks beneath a deep-ocean trench
  7. 17. where the Earth’s crust has broken
  8. 18. forms when crust diverges on land
  9. 20. new crust pushes old rock further from mid-ocean ridges
Down
  1. 2. theorized that the continents slowly moved over the surface of Earth
  2. 3. underwater mountain range
  3. 4. remnant of something that existed long ago; preserved in rock
  4. 5. forms faults
  5. 6. plates come together
  6. 7. causes the Earth’s plates to move
  7. 8. when molten material hardens quickly, these form
  8. 10. mass divided by volume
  9. 11. where oceanic crust bends downward
  10. 15. outer shell of the lithosphere
  11. 19. measures distance to an object through sound waves