Plate Tectonics

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Across
  1. 2. earths magnetic field reversals
  2. 5. the smallest of all plates
  3. 7. where roughly 80% of earths volcanoes lie
  4. 8. the theory that tried to explain why the continent moved before plate tectonics
  5. 12. the largest of all plates
  6. 13. consists of the crust and the upper mantle
  7. 15. the number of major plates
  8. 17. a type of boundary where two plate come together
  9. 18. a place where lithosphere descends into the mantle
Down
  1. 1. example of seafloor spreading and a rift zone
  2. 3. the scientist who proposed continental drift
  3. 4. ancient magnetism preserved in rocks
  4. 6. an instrument used to study earthquakes
  5. 9. a type of boundary where two plates slide past each other
  6. 10. allows for the movement of the lithosphere
  7. 11. a type of boundary where two plates move apart
  8. 14. ancient supercontinent before it was split apart
  9. 16. caused by the rising of mantle material to form islands and volcanoes