Continental drift

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Across
  1. 2. Converge, Diverge, Transform
  2. 5. solid part of the upper mantle
  3. 7. solid ball of metal
Down
  1. 1. layer of rock that forms continents
  2. 3. liquid layer about 2,300m thick
  3. 4. wave of energy caused by earthquakes and other rock movement
  4. 6. Largest layer of earth