Plate Tectonics

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Across
  1. 3. A very deep valley in the ocean floor
  2. 5. When two plates move away from each other
  3. 7. When two plates move toward each other
  4. 9. When one plate slides under another and sinks into the mantle
  5. 10. Crust: The thin, dense part of Earth's outer layer under the oceans
  6. 12. Crust: The thick part of Earth's outer layer that forms the land we live on
  7. 13. Lithosphere: The outer layer under the oceans
  8. 15. The rigid outer part of Earth, including the crust and top of the mantle
  9. 16. The belt-like motion of tectonic plates
  10. 18. Lithosphere: The outer layer under the continents
  11. 19. A place where two plates meet
Down
  1. 1. An ancient supercontinent that existed millions of years ago
  2. 2. An underwater mountain range where new crust forms
  3. 4. Drift: The idea that continents slowly move over time
  4. 6. Plate: A large piece of Earth's outer shell that moves around
  5. 8. The softer layer below the lithosphere where plates move
  6. 11. The movement of heat that helps drive plate motion
  7. 14. A huge landmass made of several continents joined together
  8. 17. Spreading: The process of making new ocean floor at underwater ridges