Plate Tectonics

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