Why doesn't the iron and nickel in the Earth's core melt?
(i mean, iron and nickel will definetly melt when heated at that kind of
temperature in the core, but why do scientists conclude that the core is
The melting point of a substance is a function of both temperature and
pressure. The temperature of the core is high enough to melt nickel and iron
on the surface of the earth where the pressure is relatively low. On the
hand, the pressure at the core of the earth is greater and therefore the
melting point is also greater... so great that it remains a solid.
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Update: June 2012