Layers of the earth

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Across
  1. 3. an igneous rock
  2. 5. Subdivided into two regions, upper and lower
  3. 7. liquid layer of the earth
  4. 9. iron
  5. 10. vibrations in the earth that transmit energy
  6. 11. nickel
Down
  1. 1. solid sphere of mostly iron and nickel
  2. 2. a substance's mass per unit of volume
  3. 4. an aphanitic (fine-grained) extrusive igneous rock
  4. 6. heat transfer that can only happen in liquids and gases
  5. 8. the earth's outermost and thinnest layer