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What valuable lightweight metal is found in massive underground reserves beneath Bolivia's Salar de Uyuni?

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Correct answer: Lithium

The stunning Salar de Uyuni is the world's largest salt flat, and beneath its white crust lies more than half of the planet's known lithium reserves. When a thin layer of water gathers on the surface during the wet season, the entire flat transforms into a giant, flawless mirror reflecting the sky. Photo: Anouchka Unel, Wikimedia Commons, FAL.

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Source: Wikipedia (CC BY-SA)

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