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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.
Confidence votes 45. The earth's crust is the thinnest under the oceans, where it is seldom more than 5 km thick. Such areas are called as rift zones. Lake Baikal in Siberia has the thinnest crust in the world. The lake itself is 1700 meter deep and has many hot water springs (due to the magma below).