Bright-blue 'potash ponds' shine alongside a dark-green river in Utah — Earth from space
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Bright-blue 'potash ponds' shine alongside a dark-green river in Utah — Earth from space

A 2017 astronaut photo shows two sets of solar evaporation ponds alongside the Colorado River. The stripy structures are used to refine potassium chloride, or "potash," which is mined nearby.