The answer is Silicon...Want to know why?

As the second most abundant element in the Earth's crust, silicon accounts for over 28 percent of its mass. Combined with oxygen, silicon dioxide is the most common compound in the crust. Most people know silicon dioxide as common sand, but it can also take the form of quartz and other crystalline rocks. Silicon is also an essential material in the manufacture of electronics and computer chips.Oxygen is the most abundant, equating to about 46%.
(Source: https://sciencing.com/eight-abundant-elements-earths-crust-8120554.html)

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