earths layers

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Across
  1. 5. the thickest layer of earth
  2. 6. the top layer of earth
  3. 7. Iron
  4. 8. nickel
  5. 9. the very center of the earth
  6. 10. layer made of liquid nickel and iron
Down
  1. 1. the heat causing rocks to fall and rise
  2. 2. lava within the earth
  3. 3. how closely it is packed with substance
  4. 4. waves in the earth caused by earthquakes