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SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Earth's internal structure, illustration. The external layer shows the Earth's surface topography and atmosphere, including land and water. This surface layer extends downwards for around 35 kilometres as the rocky crust. The mantle (red and orange) is a viscous layer of rocks under high pressures and temperatures, extending downwards to a depth of around 2890 kilometres. The outer core is a liquid layer of iron and nickel, around 2260 kilometres thick. The inner core (yellow sphere) is a solid sphere of a iron-nickel alloy, with a radius of 1220 kilometres.
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