earth down side what have
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Deep in the centre of the planet is the 'innercore', which we think is made of solid iron and nickel.
Beneath that is the mantle, which is itself made of three different sub-layers: the upper mantle, the transition zone, and the lower mantle. Together, they're about 1,800 miles (2,900 kilometers) thick, and they make up about 84 percent of the planet's volume
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