Why is the inner core expanding?

Name: Why is the inner core expanding?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The inner core is expanding due to crystallization. As the Earth's core cools down, some of the liquid outer core freezes onto the solid inner core, causing it to grow slightly in size over time. This process releases heat, which helps to power the Earth's geodynamo and generate the planet's magnetic field.

Why Is the Inner Core Expanding