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What's the most abundant element in Earth's crust?

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The crust is the outermost layer of the Earth. It is the part of Earth where we and all the other life forms live. Continents and ocean floor all are part of the crust. The other two layers of Earth include the mantle and core. The crust is made up of a number of elements. Among the various elements known to us, Oxygen is the most abundant element in the Earth's crust. It contributes to about 46.6% of the weight of the crust. The next most abundant element is silicon, which contributes to about 27.7% of the weight of the crust. 

Given the high abundance of oxygen and silicon in Earth's crust, a significant fraction of the minerals are silicates. Other abundant elements include aluminum, iron, calcium, sodium, potassium, etc.

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