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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 crust is about 0.5 % of the earthâs total mass. 2  The crust is made up of silicate rocks such as granite and basalt. 3  The continental crust is much thicker than the oceanic crust as shown here in the diagram of the earth's crust. Continental crust (continental cratons) - Where there are continents the crust is about 30 to 50 km thick. 2  It is made up of igneous, metamorphic, and sedimentary rocks. 3  The continental crust is less dense than the oceanic crust.