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Photo by: Jassen Todorov

Bacteria Creates Vivid Colors in Yellowstone's Grand Prismatic Spring

by / September 9, 2014

The Grand Prismatic Spring in Wyoming's Yellowstone National Park is the nation’s largest hot spring. It is 160 feet deep and reaches 160 degrees Fahrenheit. The spring’s vivid colors are produced by pigmented bacteria that grow around water.

In summer, the rim of the spring tends to be orange and red in color, and dark green in winter. The spring also discharges an estimated 560 gallons of water per minute.