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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.
Layers of the Earth-page 4 of 5. The mantle is 84% of the Earth's mass, making it the thickest layer of the earth. We said earlier that it's highly viscous, and it's temperature ranges from 500 degrees Celsius at the crust to 4,000 degrees near the outer core.That means that the coolest part of the mantle is more than five times hotter than boiling water. OUCH!e said earlier that it's highly viscous, and it's temperature ranges from 500 degrees Celsius at the crust to 4,000 degrees near the outer core. That means that the coolest part of the mantle is more than five times hotter than boiling water. OUCH!