Geologists have long known that
Earth’s
core, some 1,800 miles beneath our feet, is a dense, chemically doped
ball of iron roughly the size of Mars and every bit as alien. It’s a
place where pressures bear down with the weight of 3.5 million
atmospheres, like 3.5 million skies falling at once on your head, and
where temperatures reach 10,000 degrees Fahrenheit — as hot as the
surface of the Sun.
The Earth's Core
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