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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.
What is the crust of the Earth? The crust is the outermost chemical layer of the Earth, of hard and brittle rock, composed of oceanic crust and continental crust. The crust is typically about 23 miles thick â¦ beneath continents, and about 6.5 miles thick beneath oceans.The crust is relatively light and brittle compared to other Earth layers.hat is the crust of the Earth? The crust is the outermost chemical layer of the Earth, of hard and brittle rock, composed of oceanic crust and continental crust. The crust is typically about 23 miles thick â¦ beneath continents, and about 6.5 miles thick beneath oceans.