Arizona is home to over 1,000 volcanoes and has three active volcanic fields, the largest of which is the San Francisco Volcanic Field near Flagstaff.

"On Earth, the Hawaiian islands were built from volcanoes that erupted as the Earth's crust slid over a hot spot - a plume of rising magma," Jacob Bleacher, a planetary scientist at Arizona State ...

Commercial air tours will soon be prohibited over Canyon de Chelly National Monument in northeastern Arizona under a plan approved this week by the Federal Aviation Administration and the National Par ...