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.
Largest cities in Canada. Toronto is the largest city in Canada by population and the largest city in the province of Ontario. As of 2011, the latest census data available, the population of Toronto is 2,615,060. Population growth in Toronto is 4.5% since the previous census in 2006. This is slower than the average national growth of 5.9%.