The effects of mining activity contribute to concerns about a number of prominent waterways.
via Discovery News http://news.discovery.com/earth/the-top-10-endangered-us-rivers-140113.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/earth/the-top-10-endangered-us-rivers-140113.htm#mkcpgn=rssnws1
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