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2015-09-20T22:13:33+08:00

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Earth's crust is made up of several elements: iron, 32 percent; oxygen, 30 percent; silicon, 15 percent; magnesium, 14 percent; sulfur, 3 percent; nickel, 2 percent; and trace amounts of calcium, aluminum and other elements. The crust is divided into huge plates that float on the mantle, the next layer.
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2015-09-21T15:23:56+08:00

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mantle is composed of the following elements- iron magnesium, aluminum and silicon and trace amounts of calcium and oxygen
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