Salt evaporation ponds are shallow artificially created ponds for producing salt from sea or brine water. The ponds are filled with sea/brine water and by the natural process of evaporation due to solar energy, the water level gradually decreases and ultimately the residual white salt crystals are harvested.
Several micro-organism like algae, brine shrimp etc. which thrive on saline water produce a beautiful multi-coloured landscape. As total evaporation takes several years, many ponds are created at the production site and depending on its age each pond has a different colour which varies from green/blue, red, orange/yellow, and brown.
Shown below are the colourful evaporation ponds at the South Bay, San Francisco, USA operated by Cargill.
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Image from Wikimedia Commons is by dro!d
Image from Flickr is by Telstar Logistics
Image from Flickr is by atmospherik
Image from Flickr is by dsearls
Image from Flickr is by dsearls
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Main source of info: Wikipedia
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