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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.
For this reason, the thickest parts of continental crust are at the worldâs tallest mountain ranges. Like icebergs, the tall peaks of the Himalayas and the Andes are only part of the regionâs continental crustâthe crust extends unevenly below the Earth as well as soaring into the atmosphere. Cratons are the oldest and most stable part of the continental lithosphere.