which layer is the hottest of the earth
The inner core is the hottest layer of the earth. The answer is 'the inner core'. The asthenosphere is the hotest which is the inner core. the inner core because it's the deepest in the earth. it is not. core is the hottest, that only reason that it is solid in the fact that it is under immense pressure. Both the Core and the mantle have the same composition, which is Iron Nickel.