Question

Which fact is true about the inner core layer of Earth?
A The inner core is Earth's thinnest layer.
B The inner core provides the magma for volcanoes.
C The inner core is hotter than the surface of the sun.
D The inner core contains the least amount of pressure.

Answer 1

C

The inner core is extremely hot—estimates put its temperature around 5,000–7,000 K, which is comparable to or slightly hotter than the Sun’s surface (~5,778 K). (It’s also the highest-pressure layer and is solid iron–nickel, not the source of volcanic magma.)