Plate Tectonics

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Across
  1. 4. -the process by which the North pole is transformed into a South pole and the South pole becomes a North pole.
  2. 5. -the mostly solid bulk of Earth's interior.
Down
  1. 1. a substance is its mass per unit volume.
  2. 2. -its lightest, most buoyant rock layer.
  3. 3. -All the earth