Which layer is hotter than other Earth layers? A Inner core
B Outer core
C Aesthenosphere
D Mantle

A Inner Core

Explanation:

Mantle is the thickest layer but it is not the hottest. The Aesthenosphere is closest to the surface of the earth and if that were the hottest, well, we would be in trouble. Outer core is not the hottest when researched in terms of temperate so the inner core is the answer