Plate Tectonics

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Across
  1. 6. molten rock in earth's surface
  2. 7. piece of lithosphere with unique geologic features
  3. 8. can form when magma erupts onto earth's surface
  4. 12. single, large ocean that covered earth's surface
  5. 14. process where oceanic seafloor forms when magma rises pushing older seafloor away
  6. 15. solid outer layer of earth made of crust and upper part of mantle
  7. 16. boundary where 2 tectonic plates are moving away from earth other
  8. 18. undersea mountain chain with steep narrow valley
Down
  1. 1. boundary where 2 plates are sliding past each other
  2. 2. sudden movement of earth's surface
  3. 3. breaking apart of earth's surface
  4. 4. boundary where 2 tectonic plate are moving toward each other
  5. 5. theory explaining how lithosphere moves and changes shape
  6. 9. single landmass that broke up to form continents
  7. 10. study of alignment of magnetic minerals in rocks
  8. 11. movement of heated material due to differences in density (different temperatures)
  9. 13. solid plastic part of the mantle
  10. 17. supercontinent that formed 300 million years ago