From Wikipedia, the free encyclopedia. The chemical compound silicon dioxide, also known as silica, is the oxide of silicon, chemical formula SiO2.It is found in nature in several forms, including quartz and opal. In fact, silica has 17 crystalline forms.he chemical compound silicon dioxide, also known as silica, is the oxide of silicon, chemical formula SiO2.
Windsor is home to 217,188 people, according to the 2016 census. Windsor's population has grown by three per cent in the past five years, but the city still fell behind the national growth rate, according to data collected during the 2016 census.
In 2011, Toronto had a population of 2,615,060, making it the fifth most populous city in North America, after Mexico City, New York City, Los Angeles, and Chicago. The Greater Toronto Area (GTA) is the most populous metropolitan area in Canada with 5,583,064 people living in the census metropolitan area as of 2011.