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.
Burlington, Ontario. Burlington (Canada 2011 Census population 175,779) is a city in the Regional Municipality of Halton at the northwestern end of Lake Ontario. Along with Milton to the north, Burlington forms the west end of the Greater Toronto Area, while its metropolitan census area is part of the neighbouring city of Hamilton.