An orange tributary of the Kugororuk River is pictured in Alaska. Scientists are trying to find out why rivers and streams across Alaska's Arctic are turning a rusty orange color.

Rivers and streams in Alaska are changing color – from a clean, clear blue to a rusty orange – because of the toxic metals released by thawing permafrost, according to a new study.

An orange tributary of Alaska's Kugororuk River Josh Koch, U.S. Geological Survey Some of the water samples had a pH of 2.3, compared to an average pH of 8 for rivers, which means the impacted ...

A new study shows that rusty discoloration in Alaska’s otherwise pristine streams and rivers is likely due to melting permafrost—and that’s a problem for Arctic animals and people.

Rivers and streams in Alaska are changing color – from a clean, clear blue to a rusty orange – because of the toxic metals released by thawing permafrost, according to a new study.

Rivers and streams in Alaska are turning orange and acidic. ... Alaska Pacific University, and the University of Alaska in Anchorage — are all trying to figure out the rusty river mystery. ...

Alaska's rivers and streams are becoming toxic as a strange "milky orange" color stains their waters, a new study has found. The research from the National Park Service, U.S. Geological Survey ...

Scientists say that dozens of waterways in Alaska are "rusting," or turning into a dirty orange. They said permafrost thawing in the summer is now exposing minerals to the surface, releasing metals ...

Rivers and streams in Alaska are changing color – from a clean, clear blue to a rusty orange – because of the toxic metals released by thawing permafrost, according to a new study.

(CNN) — Rivers and streams in Alaska are changing color – from a clean, clear blue to a rusty orange – because of the toxic metals released by thawing permafrost, according to a new study.