explains the various layers on the earth and its effects on human life.
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The Earth comprises four separate layers. Most of the geologist believes that as the Earth cooled the heavier, the materials denser sank into the center, and the lighter ones rose towards the top. Due to this, the outermost layer is made of the lightest materials such as rocks and granites and the innermost layer consists of nickel and iron.
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The cycling of oxygen at the Earth's surface is central to the life and activity that takes place at the surface, but it is equally essential in the Earth's mantle," Kelley said in a statement. "The availability of oxygen to the mantle is in part controlled by the oxygen at the surface."
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