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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.
Earth's mantle is the thickest part of the planet and consists of very hot and plastic like solid rock. The mantle is divided into the lower and upper mantle, with the upper mantle making up 15.3 percent of the mantle crust mass and 10.3 percent of Earth's total mass. Learn more about Layers of the Earth