Silicon dioxide - Simple English Wikipedia, the free encyclopedia
https://simple.wikipedia.org/wiki/Silicon_dioxide
WEBSilicon dioxide - Simple English Wikipedia, the free encyclopedia. Silicon dioxide, also known as silica, is a chemical compound, the oxide of silicon. Its chemical symbol is SiO 2. It is known for its hardness since the 16th century.
DA: 83 PA: 19 MOZ Rank: 87