chapter 10 plate tectonics

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Across
  1. 2. contain large areas of stable rock
  2. 4. boundary boundary in which two plates slide past each other horizontally
  3. 6. single large ocean that covered earths surface during the time the supercontinent
  4. 7. cycle form an break apart over time
  5. 8. the study of magnetic properties of rock
  6. 10. boundary 2 plates move away from each other
  7. 12. drift a germen scientist names Alfred Wegener proposed a hypothesis
  8. 15. terranes may be small volcanic or underwater valcaones
  9. 17. rigid upper part of the mantle form a layer of earth
  10. 18. process in which continents break apart
  11. 19. ridge undersea mountain range through the center of which run steep, narrow valleys
Down
  1. 1. exposed at earths surface
  2. 2. boundaries plate boundaries that form where 2 plate collide
  3. 3. piece of lithosphere that has a unique geologic history that differs from the history of the surrounding lithosphere
  4. 5. continents arranged into large landmasses
  5. 9. layer of plastic rock just below the lithosphere
  6. 11. terrane becomes part of a continent
  7. 13. form on top of seamounts
  8. 14. formed over 30 million years ago
  9. 16. spreading new ocean floor forms when magma rises to earths surface and solidifies at a mid ocean ridge