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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 coldest matter in the world is a Bose-Einstein condensate of atoms that have been cooled to within tiny fractions of a kelvin of absolute zero (-273 C). The coldest material generally available is liquid nitrogen (temperature - 196 C, - 320 F). The coldest place on Earth is the Antarctic Plateau, with temperatures as low as -90 C (-129 F).