n. A white or colorless crystalline compound, SiO 2, occurring abundantly as quartz, sand, flint, agate, and many other minerals and used to manufacture a wide variety of materials, especially glass and concrete.ilicon dioxide, SiO 2, a compound that occurs widely in rocks and mineral forms, such as quartz, sand, and flint, and is used to make glass, concrete, and other materials.
Greater London is a ceremonial county of England. It was created on 1 April 1965, covering the 32 London boroughs, and excludes the City of London.The region covers 1,572 km 2 (607 sq mi) and had a population of 8,174,000 at the 2011 census. It has the highest GVA per capita in the United Kingdom at Â£37,232.he term London is normally used in reference to Greater London or to the conurbation, but not often to the ancient, tiny City of London. This small area is often referred to as the City or the Square Mile and it forms the main financial district.
London /ËlÊndÉn/ is the capital and most populous city of England and the United Kingdom. Standing on the River Thames, London has been a major settlement for two millennia, its history going back to its founding by the Romans, who named it Londinium.he etymology of London is uncertain. It is an ancient name, found in sources from the 2nd century. It is recorded c. 121 as Londinium, which points to Romano-British origin. The earliest attempted explanation, now disregarded, is attributed to Geoffrey of Monmouth in Historia Regum Britanniae.