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Best Answer: The crust or lithosphere is the coolest layer by far. It is what we live on. It is in the vicinity of 0 degrees C (varying with depth and location). The mantle is about 1,700 miles (2,750 km) thick.
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.