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How do salt flats like Bolivia’s Salar de Uyuni form?

GeologyEvaporites

Quick Answer

They develop when lakes or inland seas evaporate and leave behind layers of salt and other minerals. Repeated flooding and drying can create a vast, flat crust.

The Full Story

Salt flats form in closed basins where water has no outlet to the sea. Minerals carried in by rivers or groundwater accumulate as shallow lakes repeatedly evaporate under dry conditions. Over time, thick deposits of halite, gypsum, and mud can build a bright, flat surface crust. Salar de Uyuni in Bolivia is the largest salt flat in the world, covering about 10,000 square kilometers.

Key Facts

1.Salar de Uyuni covers about 10,000 square kilometers
2.Salt flats form in closed basins with high evaporation
3.Halite and gypsum commonly build the crust

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Suggested video title for this topic:

"How does a vanished lake become a giant mirror of salt?"