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LAYERS OF THE EARTH Pg. CRUST Rocky outer layer of Earth, both continental and oceanic crust MANTLE Thick layer of hot but solid rock. LITHOSHPERE ASTHENOSPHERE MESOSPHERE CORE Temperatures estimated to be the same as the surface of the sun. 800 miles thick Iron, Nickel solid state 1400 miles thick Iron, Nickel liquid state 1800 miles thick consistency of asphalt 5-25 miles thick