Geology

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Across
  1. 4. a fresh water reptile
  2. 7. a chain of volcanic islands generally located a few hundred km from a trench.
  3. 10. a seed fern
  4. 11. one of two smaller supercontinents
  5. 13. ridges elevated areas on the seafloor characterized by high heat flow
  6. 15. represent divergent plate boundaries
  7. 16. occurs when material is heated
  8. 17. a hypothesis which suggested that all present continents existed as one super continent.
  9. 18. the southernmost smaller of two supercontinents
  10. 19. occurs when material cools
  11. 20. Came up with the Continental Drift theory.
Down
  1. 1. is the primary driving force for movement of tectonic plates
  2. 2. a narrow, elongated depression of the seafloor
  3. 3. a boundary in which two plates move together
  4. 5. spreading a hypothesis, first proposed in the 1960s by Harry Hess
  5. 6. a well tested theory proposing of that Earth’s outer shell consists of individual plates.
  6. 8. s boundary in which two plates slide past each other
  7. 9. supercontinent containing all of the existing continents
  8. 12. Plate Boundary a boundary in which two plates move apart resulting in the upwelling of material.
  9. 14. The largest plate in the world.