explajn the various layers of the earth and its effect on the human life
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The top layer, which is what we stand on is the crust, next comes the mantle and finally the core. Some of these layers are made up of even more layers and they're always on the move. The Earth is mostly made of rock and metal.
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the cycling of oxygen at the earth surface is central to the life and activity that takes place at the surface, but it is equally essential in the earth mantle ",Kelley said in a statement. the availability of oxygen to the mantle is a part of controlled by the oxygen at the surface".
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