Sunset Crater Volcano National Monument highlights northern Arizona’s volcanic (and explosive) past, speckled with cinder cones and long-hardened lava ... Sinagua means “without water,” the label ...

When temperatures drop, 'ice volcanoes' rise. That's what's happening ... the fountain's water freezes in midair, forming a cone of ice crystals. Each year, weather conditions dictate exactly ...

Pseudocraters or rootless cones are peculiar volcanic formations with an explosive origin. They do not form from magma coming from deep underground. They are caused by lava covering a water-rich ...