NASA's Earth Observatory Image of the Day is from the Advanced Land Imager (ALI) on NASA’s Earth Observing-1 (EO-1) satellite, which captured this natural-color image on April 17, 2010. SP Crater is a basaltic cinder cone in the San Francisco Volcanic Field, northeast of Flagstaff.
References from NASA:
- Anderson, R. (2009, March 16). SP Flow and Sunset Crater. Martian Chronicles, AGU Blogosphere. Accessed February 17, 2011.
- Priest, S.S., Duffield, W.A., Malis-Clark, K., Hendley, J.W. II, Stauffer, P.H. (2001, December 21). The San Francisco Volcanic Field, Arizona. U.S. Geological Survey Fact Sheet 017-01. Accessed February 6, 2011.
- Volcano Hazards Program Photo Glossary. (2008, July 17). Cinder Cone. U.S. Geological Survey. Accessed February 6, 2011.
- Volcano Hazards Program Photo Glossary. (2009, July 17). Basalt. U.S. Geological Survey. Accessed February 6, 2011.