Earth's innermost core is solid, not liquid, because:
A) the core temperature is too low to melt iron
B) differentiation caused all of the heavy, solid material to sink to the bottom while Earth was forming
C) all the liquid has moved up into the mantle via convection
D) the pressure is too high for the material to be in a liquid state
E) Iron does not melt

Question

Quizplus · Accepted Answer

The pressure at the Earth's inner core is incredibly high, estimated to be around 3.5 million times atmospheric pressure at sea level. This pressure is so great that it prevents the iron from melting, which would result in a liquid state. Therefore, the Earth's innermost core remains solid.

Earth's Innermost Core Is Solid, Not Liquid, Because