Layers of the Earth

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Across
  1. 3. Outermost physical layer of the Earth
  2. 4. This chemical layer is made mostly of Nickel and Iron
  3. 6. Convection takes place in this chemical layer
  4. 7. Innermost physical layer of the Earth
  5. 8. Tectonic plates float on this physical layer
Down
  1. 1. Thickest physical layer of the Earth
  2. 2. This chemical layer is made mainly of oxygen, silicon, and aluminum
  3. 5. Physical layer made of liquid metal