Largest region of Earth’s interior

The largest region of Earth's interior is the mantle, a layer of semi-molten rock that extends 2,891 km (1,796 mi) from the underside of the crust to the liquid outer core. The mantle makes up around 84% of the total volume of the planet. Slow convection in the mantle is what drives plate tectonics in the Earth’s crust. Temperatures in the mantle range from 500°C (932°F) at the crustal boundary to over 4,000°C (7,232°F) at the boundary with the outer liquid core.