Acid Lake Rio Tinto in Spain

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This is one very strange natural phenomena. As you can see the color of lake water is very strange that is orange, or rather like the color of rust on iron. Extremely acidic lake water is rarely the case. But in Spain this phenomenon is found.
Tentative conclusions of the experts is a strange color in the lake water in the Rio Tinto sebabkaan by aerobic micro-organisms kind of extremophile bacteria.