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Layers of Earth
Crust Outermost layer Thinnest under ocean Thickest under continent Crust + top of mantle = Lithosphere
Crust density Least dense overall layer Oceanic crust (basalt) is more dense than Continental Crust (granite)
Crust composition Solid rock—mostly silicon and oxygen Oceanic crust—basalt Continental crust--granite
Mantle Position Middle layer, thickest layer Top portion called the asthenosphere
Mantle Density Density increases with depth of increasing pressure
Mantle Composition Hot softened rock Contains iron (Fe) and magnesium (Mg)
Core position Inner layer Consists of the outer and inner core
Core density Heaviest material; most dense layer
Core composition Mostly iron and nickel Outer core—slow flowing liquid Inner core--solid
Thickness of Layers Crust: (continental) miles thick (1 % of Earth’s volume) Mantle: 1,800 miles thick (84% of Earth’s volume) Outer core: 1,400 miles thick Inner core: 790 miles thick
Inner Core – the dense, solid center of the earth, formed mostly of iron and nickel Outer core – the liquid layer of the earth’s core that surrounds.
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