Plate tectonics

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Across
  1. 5. The theory that earth is made of giant, moving slabs
  2. 6. the process that creates new sea floor
  3. 8. A system of ideas that explains many related observations.
  4. 9. this prefix means under
Down
  1. 1. Any movement of matter that results from differences in density
  2. 2. the hypothesis that the continents were once part of a single land mass.
  3. 3. the outermost layer on the earth
  4. 4. The change of the magnetic poles
  5. 7. One plate's edge being pushed under another plate