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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