Shiprock Peak is all that remains of a large volcanic cinder cone. This eroded volcanic neck stands 1,380 feet and was formed from crystallized magma, an igneous rock. This sacred peak of the Navajo is located near the Four Corners, where Colorado, Utah, New Mexico and Arizona's common borders meet. Volcanoes and volcanic rock make the New Mexico landscape unique. Most of the cities of New Mexico are situated by nearby extinct volcanoes. Surprisingly, there are more inactive volcanoes surrounding Albuquerque than any other city in the United States. The Rio Grand Rift, or fault, runs the length of New Mexico. Today, there is no volcanic activity in the state of New Mexico, but molten rock lurks just 12 miles below the earth's surface near the towns of Socorro and Belen. The last eruptions occurred in the El Malpais area about three thousand years ago.