Here's a breakdown of the Earth's layers by volume:
* Mantle: About 84% of Earth's volume. It's a thick layer of mostly solid rock, but it behaves like a very viscous fluid over long periods.
* Core: About 16% of Earth's volume. This is further divided into a liquid outer core and a solid inner core.
* Crust: Makes up less than 1% of Earth's volume. This is the thin, outermost layer of solid rock we live on.
