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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 combination of. convection currents from the mantle and the effects of the atmosphere make the crust about -17.7 - 870C ( 0 -1598 F) from the surface to the bottom of the crust. The crust and atmosphere are the coolest of earthâs layers. The Mantle (Mesosphere, Asthenosphere, Lower Lithosphere) The layer beneath the crust and above the core is the mantle. It is 2,868 km kilometers (1,800 miles) thick and makes up nearly 80 percent of the earthâs total volume. The mantle has an average density of 4.5gcm3. The density