Crossword Puzzle

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Across
  1. 7. occurs on the seafloor where oceanic plates are moving away from each other (diverging)
  2. 8. are pieces of the lithosphere and crust, which float on the asthenosphere
  3. 9. It is the rising or settling of a portion of the Earth's lithosphere that occurs when weight is removed or added in order to maintain equilibrium between buoyancy forces that push the lithosphere upward and gravity forces that pull the lithosphere downward
  4. 10. the that the Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed.
Down
  1. 1. one of the discoveries of seafloor spreading. He proposed the idea of seafloor spreading in 1960
  2. 2. hypothesis of isostasy where mountain range supported by density variation within the crust
  3. 3. A german geologist who proposed the theory of continental drift
  4. 4. mountain range supported by changes in crustal thickness
  5. 5. a supercontinent that incorporated almost all the landmasses on Earth
  6. 6. a theory that states that it is tectonic plates, rather than continents, which are moving.