The crust is minuscule compared to the core and mantle.

The mantle makes up about 84% of Earth’s total volume. The temperature varies from about 1 300 K (1 000°C, 1 832°F) near its boundary with the crust, to 4 000 K (3 700°C, 6 692°F) near its boundary with the core. education.nationalgeographic.org/…/mantle/

The temperature in the Earth’s core is uncertain: estimates at the inner core boundary range from 4 000 K to 8 000 K and at the core–mantle boundary from 3 000 to 4 500 K. www.homepages.ucl.ac.uk/~ucfbdxa/…/nat.pdf