The Rocky Mountains conjure up images of grey rugged peaks capped with white. But within the upper reaches of the harsh mountain landscapes, a rosier hue often blooms.
Watermelon snow, also known as glacial blood, is caused by algae that turns the snow a startling shade of red.
The algae blooms in summer, forming on the snowfields that linger on glaciers, frozen lakes, rugged peaks and icy valleys in the upper reaches of mountain terrain.
The darker the snow, the faster it melts — and new research sheds light on the threat snow algae poses to shrinking glaciers across northwestern North America.
Snow algae
