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  2. Oil sands - Wikipedia

    en.wikipedia.org/wiki/Oil_sands

    Oil sands, tar sands, crude bitumen, or bituminous sands, are a type of unconventional petroleum deposit.Oil sands are either loose sands or partially consolidated sandstone containing a naturally occurring mixture of sand, clay, and water, soaked with bitumen, a dense and extremely viscous form of petroleum.

  3. Arch - Wikipedia

    en.wikipedia.org/wiki/Arch

    Gateway Arch in St. Louis, Missouri; a sculpture based on a catenary arch (2011) Pont Flavien over the River Touloubre in Saint-Chamas , Bouches-du-Rhône , France (2008) Old stone bridge in Kerava , Finland (2011)