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The sulphur pyramids on the Syncrude oil sands site which are made of solid sulphur that is trapped from the air emissions of the Syncrude 'upgrader' plant where raw bitumen is separated into oil and sand. The sulphur pyramids are constantly growing and are also the largest pyramids in the world.
Ian Willms/Panos Pictures /Felix Features 28 Aug 2015
Not available in Canada