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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.
Thanks to satellites and moon walks, weâre assured that the Earth is a big blue sphere. We can see it and measure it directly. âBut we know little about the temperature of the deepest parts of Earthâs continental crust, which can be 30â40 kilometers below the surface,â Braun says.