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Supervolcanoes
The Infinite Monkey Cage
The Mantle of the Earth
The earth is made up of iron, steel magma and a lot of gobbons. The planet's radius is about 6,400 kilometers - the distance from London to Chicago. Heat comes from radioactivity as well as primordial heat locked into it by formation. How far down would you have to dig to reach the mantle? Kilometres.
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