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.
Toronto's 2017 population is now estimated at 6,170,000. In 1950, the population of Toronto was 1,068,000. Toronto has grown by 177,000 in the last year, which represents a 3.00% change. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects.