Plate Tectonics

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Across
  1. 1. the deepest parts of the oceans.
  2. 4. The Earth's ______________ field reverses from time to time.
  3. 7. what causes plate tectonics
  4. 8. Scientist who first proposed that thermal convection in the mantle causes continental drift.
  5. 12. the most outer solid portion of the planet Earth
  6. 13. what is one of the three types of boundaries?
  7. 14. what is one of the three types of boundaries?
  8. 15. the Theory of Continental _____________.
  9. 18. what is the plastic layer below the lithosphere
  10. 20. Alfred Wegener noticed that the coast of South America seemed to fit into the coast of this continent, just like a jigsaw puzzle
Down
  1. 2. places where the sea floor is forced under
  2. 3. Plate _____________
  3. 5. Section of the Earth below the crust
  4. 6. what is the liquid layer of the earth’s core
  5. 9. scientist who first proposed the theory that the continents drifted
  6. 10. what is one of the three types of boundaries?
  7. 11. what causes sea floor spreading
  8. 16. paleontologists noticed that these were the same on different continents even though the continents were separated by oceans
  9. 17. what is the crust and part of the upper mantle
  10. 19. Seafloor ______________