Plate Tectonics

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Across
  1. 4. the middle layer and one of the thickest layers of the earth.
  2. 5. solid rock that flows slowly.
  3. 7. adjoins the crust to form the lithosphere.
  4. 8. made mostly up of iron, very hot.
  5. 10. two plates that are sliding past each other.
  6. 12. outer layer.
  7. 14. when the denser oceanic plate subducts under the continental plate.
  8. 15. two plates that move apart or rift.
  9. 18. the gradual movement as the continents drift apart over time.
  10. 19. when the material pushes upward after the collision of two plates.
  11. 20. a scientific theory that explains the earth's continental movements.
Down
  1. 1. the collision of two plates.
  2. 2. rigid outer layer (crust).
  3. 3. apart of the middle layer and has a higher temperature and pressure than the upper mantle.
  4. 6. liquid layer.
  5. 9. process that occurs at mid-ocean ridges where oceanic crust is formed where volcanic activity has occurred.
  6. 11. when the denser oceanic plate subducts under the other one.
  7. 13. when a more dense oceanic plate slides under a less dense continental plate.
  8. 16. solid very dense.
  9. 17. a supercontinent that incorporated almost all of the continents together a few hundred years ago.