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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 Earth's Crust. At the very surface of the Earth is the crust, the topmost layer, made mostly out of solid silicate rocks like basalt and granite. The crust is like the icing on a cake, though not nearly so tasty. We humans live on top of the crust; you can think of us as the strawberries or gummy bears on the top of the cake.