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Seismic data of the Earth has led to a model of the interior that partitions it into a core, mantle, and crust. The crust is approximately 30 kilometers thick. The mantle is approximately 2,840 kilometers thick, and the core radius is approximately 3,500 kilometers thick. Each partition can be further divided into smaller regions. The crust can be classified as oceanic or continental, the mantle as upper and lower, and the core as outer liquid and inner solid.   Pictured in this cutaway view of the Earth is the crust, mantle, liquid outer core, and solid inner core.
Earth is the 3rd planet from the Sun at a distance of about 150 million kilometers (93.2 million miles). It takes 365.256 days for the Earth to travel around the Sun and 23.9345 hours for the Earth rotate a complete revolution. It has a diameter of 12,756 kilometers (7,973 miles), only a few hundred kilometers larger than that of Venus. Our atmosphere is composed of 78 percent nitrogen, 21 percent oxygen and 1 percent other constituents.   Earth is the only planet in the solar system known to harbor life. Our planet's rapid spin and molten nickel-iron core give rise to an extensive magnetic field, which, along with the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Earth's atmosphere protects us from meteors, most of which burn up before they can strike the surface.  
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