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Which massive engineering marvel spans 800 miles from Prudhoe Bay to the ice-free port of Valdez?

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Correct answer: Trans-Alaska Pipeline System

Completed in 1977, the Trans-Alaska Pipeline System was designed to transport crude oil across rugged terrain, active fault lines, and permafrost. More than half of the pipeline is elevated on special supports to prevent melting the frozen ground below. Photo: Luca Galuzzi (Lucag), Wikimedia Commons, CC BY-SA 2.5.

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Source: Wikipedia (CC BY-SA)

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