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The Earth's Interior Structure Compositional Layering Mechanical Layering Crust Lithosphere Asthenosphere Mantle Mesosphere Outer Core Core Inner Core Crust: relatively light silicate minerals 'the cream that floated to the top soon after the Earth formed' 5 to 40 miles thick Mantle: relatively dense silicate minerals (olivine) Just under 2000 miles thick Core: Mostly iron with some nickel Just over 2000 miles thick 'the heavy stuff that sank to the middle' Lithosphere: Earth's rigid outer shell 60 miles (100 km) thick includes the crust and the uppermost mantle Asthenosphere: relatively weak, plasticy layer in the mantle Mesosphere: 'middle sphere'; lower mantle Outer core: liquid Inner core: solid