The Rio Tinto in Huelva, Spain, exhibits striking red and orange iron-rich deposits and green microorganism traces

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Photo credit: © Agustín Orduña Castillo / Alamy / Afripics
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Keywords: acid, acidic, bacterial, beauty, biofilm, biogeochemistry, colors, condition, deposits, ecological, ecosystem, environment, environmental, extremophiles, geology, geomicrobiology, green, huelva, iron-rich, landscape, mat, metallic, microorganisms, mineralogy, mining, natural, orange, outdoor, oxidation, patterns, red, rio, river, spain, sulfuric, tinto, toxic, unique, vivid, waters