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Crater Lake is located in the caldera of Mount Mazama in Crater Lake National Park, Oregon. The lake has a surface area of about 53 km2at an elevation of 1882 m and a maximum depth of 594 m. Limited studies of this ultraoligotrophic lake conducted between 1896 and 1981, lead to a 10-year limnological study to evaluate any potential degradation of water quality. No long-term variations in water quality...
The Rio Agrio watershed in northern Patagonia, Argentina is naturally acidic due to discharges of volcanic H 2 SO 4 , HCl, and HF at its headwaters near the summit of Copahue Volcano. A suite of water samples was collected from the summit of the volcano to a point roughly 40 km downstream where the pH of the Rio Agrio rose above 6.0. This suite included a sample of the hyperacidic...
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