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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.
Beneath the Earthâs crust is the mantle, which is made up of a layer of gooey hot magma, semi-solid rocks and minerals. The mantle has a depth of about 1806 miles from the crust and reaches temperatures close to 1,832 degrees Fahrenheit. The core, the inner layer of the Earth, has the hottest temperature. It is divided into two sections: the outer core and the inner core. The outer core, the region surrounding the inner core, has a depth of 3,981 miles from the Earth's crust and is slightly cooler than the inner core, with temperatures close to 6,692 degrees Fahrenheit.