Geology

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Across
  1. 1. most inner part
  2. 2. presented by Hess
  3. 4. move together
  4. 6. long crack in the crust
  5. 8. thickest layer
  6. 9. presented by Wegener
Down
  1. 1. press
  2. 3. move apart
  3. 4. outer layer
  4. 5. pieces of the crust
  5. 7. slide past