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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 is made up of four distinct layers: 1  The inner core is in the centre and is the hottest part of the Earth. 2  The outer core is the layer surrounding the inner core. 3  The mantle is the widest section of the Earth. 4  The crust is the outer layer of the earth. The mantle is made up of semi-molten rock called magma. 2  In the upper parts of the mantle the rock is hard, but lower down the rock is soft and beginning to melt. 3  The crust is the outer layer of the earth. 4  It is a thin layer between 0-60 km thick.