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| structure of the earth | |
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The Earth has several distinct layers, the deepest of which is the core. The inner core is composed mainly of a Nickel - Iron Alloy and some lighter elements (probably Sulfur , Carbon , Oxygen , Silicon and Potassium ). The inner core is very hot and is under extreme pressure. Temperatures there can reach 5,000 to 6,000 °C (>9,000 °F). However, unlike the outer core, the inner core remains solid due to the extremely high pressure. The average density of the core is about 15 g/cm³. The inner core has a radius of about 1,220 km (about 800 miles) and is located from 5,100 to 6,300 km (3,200 to 4,000 miles) below earth's surface. Recent discoveries suggest that the solid inner core itself is composed of layers, separated by a transition zone about 250 to 400 km thick. SEE ALSO Structure Of The Earth |
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