Plate Tectonics

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