Word definitions

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Across
  1. 2. The inner most layer of the Earth. Made up of iron and nickel the pressure here is so intense it is a solid sphere
  2. 4. The middle most layer of the Earth. It is the bulk of the Earth making up 84% of the Earths weight. Roughly 2900km thick.
Down
  1. 1. The outer most layer of the Earth. Rock and soil from 5-70km down.
  2. 3. A fluid layer about 2260km thick, mostly iron and nickel