出典:Wiktionary
出典:『Wiktionary』 (2010/09/06 20:19 UTC 版)
出典:『Wiktionary』 (2008/06/18 21:40 UTC 版)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/23 12:22 UTC 版)
Bituminous sands, colloquially known as oil sands or tar sands, are a type of unconventional petroleum deposit. The sands contain naturally occurring mixtures of sand, clay, water, and a dense and extremely viscous form of petroleum technically referred to as bitumen (or colloquially "tar" due to its similar appearance, odour, and colour). Oil sands are found in large amounts in many countries throughout the world, but are found in extremely large quantities in Canada and Venezuela.