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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.
1 The mantle extends from where the crust ends to about 2,890 km, making it the thickest layer of Earth. 2  The mantle is also composed of silicate rocks, but the mantle as a whole is very viscous â the high temperatures there cause the silicate material to be sufficiently ductile that it can flow (in a very long time).he Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the crust is the thinnest layer of the Earth, amounting for less than 1% of our planetâs volume.