Plate things

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Across
  1. 5. dense hot and dry
  2. 6. under crust
  3. 7. cracks in the surface
  4. 8. less dense granite
  5. 10. thinnest layer
Down
  1. 1. moving apart
  2. 2. tends to shift
  3. 3. moving together
  4. 4. more dense granite
  5. 9. sliding past