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…showed last 75 words of 395 total…these days to draw a crowd. There are very acidic lakes around volcanoes and yes, you would not want to swim in them...and yes, metal parts can corrode in acid lakes; a thin metal cable might dissolve on a movie timescale. The acids may be sulfuric and hydrochloric acid, plus others, and the acidity can be quite high, hundreds to thousands of times as acidic as lemon juice or vinegar, or EVEN Coca Cola!