Salt Ponds Botswana
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Salt Ponds, Botswana

April 19, 2011
This photo from the International Space Station shows the salt ponds of one of Africa's major producers of soda ash (sodium carbonate) and salt. Soda ash is used for in making glass, in metallurgy, in the detergent industry and in chemical manufacture.

Red, salt-loving algae in the ponds indicate that the salinity of the evaporating water is medium to high.

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