Layers of the Earth

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Across
  1. 1. why we have layers
  2. 3. one of the elements in the core
  3. 5. the heat causing rocks to rise and fall
  4. 9. layer between the inner core and the mantle
Down
  1. 2. the type of waves something that helps scientists learn about the layers of the Earth
  2. 4. Earth's largest layer
  3. 6. Earth's thinnest layer
  4. 7. solid ball of metal made of nickel and iron
  5. 8. the number of layers Earth has