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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 Earthâs crust is the outermost layer of the Earthâs structure. In fact, the crust is what youâre standing on. But geologists have learned that if you dig down into the Earth, even just a few hundred meters, and things start to heat up. The inside of the Earth is hot!