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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.
The Earth has many layers. The three main layers of the Earth are: The crust (The outermost layer of the Earth). The mantle (Middle layer of the Earth) and. The core (Inner layers of the Earth). The crust is the outermost layer of the Earth and the thinnest of the layers. The Earth's crust is where the mountains, hills, valleys, plains, lakes and oceans are formed. The mantle is the largest layer of the Earth. The mantle is much hotter than the crust, just as the core is much hotter than the mantle.