Question

Why is it important for Earth’s magnetic field that the inner core is hotter than the outer core?

The inner core provides the heat source for outer core convection.
The inner core’s heat produces the Coriolis effect needed for rotation.
The inner core’s heat allows the outer core to conduct electricity.
The inner core provides the energy for Earth’s orbit around the Sun.

Answer 1

Answer: The inner core provides the heat source for outer core convection.

Explanation: The fact that the inner core is hotter than the other core allows for the bottom of the outer core to be heated. As this happens, it expands and rises up to the top of the layer. As it rises, it cools and sinks back down to the bottom, just to be warmed again.