Continental Drift Vocabulary

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Across
  1. 4. Spreading the usual process at work at divergent plate boundaries, leading to the creation of new ocean floor
  2. 5. a fracture or zone of fractures between two blocks of rock.
  3. 6. Boundary occurs when two tectonic plates move away from each other.
  4. 7. Valley an area where the earth's crust is splitting apart
  5. 8. long, narrow depressions on the seafloor. These chasms are the deepest parts of the ocean—and some of the deepest natural spots on Earth.
  6. 10. Push The upward movement of hot material causes the lithosphere to be moved upward and sideways and be split
  7. 13. Current heat-driven cycles that occur in the air, ocean, and mantle.
  8. 15. Boundary an area on Earth where two or more lithospheric plates collide
  9. 17. these are the areas of the ocean that are below sea level
  10. 18. Zone where two oceanic plates collide with one another and the denser plate goes under the less dense plate
  11. 19. Islands an island of volcanic origin.
  12. 20. tectonic Theory theory that Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving since about 3.4 billion years ago.
Down
  1. 1. Boundary places where plates slide sideways past each other.
  2. 2. the study of the history of Earth’s magnetic field
  3. 3. Pull The downward movement of cooled material causes the plates to be dragged along with it
  4. 9. Drift hypothesis Wegner developed to explain the separation or movement of the continents.
  5. 11. Plates gigantic pieces of the Earth's crust and uppermost mantle.
  6. 12. The remains of an organism preserved in rock
  7. 14. Ridge seafloor mountain system formed by plate tectonics
  8. 16. supercontinent