Plate Tectonics

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Across
  1. 3. earth's interior between the crust and the core
  2. 5. the rigid outer part of the earth in the upper mantle also
  3. 7. the force that attracts a body toward the center of the earth
  4. 8. Drift a theory that explained continents were together once
  5. 11. Boundary when the plates slide sideways past each other
  6. 13. an extended break in in a body of rock
  7. 14. Boundary when two plates are moving toward each other
  8. 17. each of the several rigid pieces of the earth’s lithosphere
  9. 18. trench any long,narrow,steep-sided depression in ocean
  10. 20. Valley a linear shaped lowland between several highlands
Down
  1. 1. the sideways and downwards movement of edges of a plate
  2. 2. Boundary the plate tectonics move away from each other
  3. 4. the upper layer of the earth’s mantle below lithosphere
  4. 6. a supercontinent that existed during the late Paleozoic
  5. 9. ridge underwater mountain range formed by plate tectonics
  6. 10. the remains or impression of a prehistoric organism persevered
  7. 12. Wegener a German scientist who proposed the theory of Pangea
  8. 15. the degree of compactness of the substance
  9. 16. floor spreading the formation of new areas of oceanic crust
  10. 19. Tectonics a theory explaining the structure of the earth’s crust