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.
Ontario's largest municipality by population is the City of Toronto with 2,615,060 residents, while the largest by land area is the City of Greater Sudbury at 3,227.38 km 2 (1,246.10 sq mi).ntario is the most populous province in Canada with 12,851,821 residents as of 2011 and is third-largest in land area at approximately 909,000 km 2 (351,000 sq mi).