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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.
Earthquakes: tectonic plates. The Earth is formed of four concentric layers that have very different physical and chemical properties: inner core, outer core, mantle and crust. The centre, or inner core, is the hottest part of planet Earth. A solid mass of iron and nickel this centre has temperatures up to 5,500 degrees Celsius.