Mountain climbers in Washington state are curious about a phenomenon they've been seeing. Some of them call it Watermelon Snow.
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At the high elevations of Mount Saint Helens they've been asking the US Forest Service about it and one ranger says it's caused by a species of "cold-loving green algae."
The darker color of the algae can darken the surface of glaciers which, they say, can increase the speed of the glacier's melting.