Rio Tinto is located in south-western Spainand originates from Sierra Morena mountains of Andalusia. The area around the river has been mined since ancient times, so a lot of minerals can be found into the water, especially iron, which makes the water red. Even some bacteria enjoy its life there, “exploiting” the iron. However, the weirdness of this river comes from its high acidity, which made some scientists say that it is very similar to the underground waters of Mars
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