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The San Francisco Volcanic Field, Arizona Link to a U.S. Geological Survey fact sheet explaining volcanic activity in northern Arizona. Color photos.
Did You Know? Flagstaff, Arizona is the world's first designated International Dark Sky City. This helps to ensure dark night skies at 3 national monuments located nearby - Wupatki, Sunset Crater Volcano, and Walnut Canyon.
Last Updated: August 21, 2006 at 11:44 EST