40 Threat Down Below: Polluted Caves Endanger Water Supplies, Wildlife: Scientific American Threat Down Below: Polluted Caves Endanger Water Supplies, Wildlife: Scientific American Health & Wellness  (tags: water, research ) Angela - 85 days ago - scientificamerican.com So Virginia environmental officials were stunned when routine sampling turned up something disturbing: Carp in the river were loaded with industrial compounds called polychlorinated biphenyls, or PCBs. add comment send green star

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Angela Y.
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