Discover Magazine looks at the highly acidic Lake Berkeley in Butte, Montana. Lake Berkeley once was an open-pit mine that ceased production in the early 1980s. When the mining came to a hault, groundwater flooded the pit. Today, Lake Berkeley has a pH of 2.6 and contains metals such as copper, cadmium and arsenic. However, while the lake appears dead, local scientists have discovered that tough bacteria and algae are actually living in the lake.
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