Using the data obtained by the Mars Rover Curiosity, scientists came to the conclusion that the crater once housed lakes. Evaporating water formed mineral veins on the surface of Mars that we can see right now. The quantity of sulfates and sodium in the Martian water was 20 times more than that which we buy in bottles, so the taste of it was very unpleasant.
Source: http://www.da-voda.com/
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