Silicon dioxide (SiO2), also known as silica, is a natural compound made of two of the earth’s most abundant materials: silicon (Si) and oxygen (O2).
Silicon dioxide is most often recognized in the form of quartz. It’s found naturally in water, plants, animals, and the earth. The earth’s crust is 59 percent silica. It makes up more than 95 percent of known rocks on the planet. When you sit on a beach, it’s silicon dioxide in the form of sand that gets between your toes.
It’s even found naturally in the tissues of the human body. Though it’s unclear what role it plays, it’s thought to be an essential nutrient our bodies need.
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