Volcanoes are one of Earth’s most powerful and mesmerizing geological features. Simultaneously beautiful and terrifying, they can hibernate for years before rumbling back to life spewing fiery ash ...

Just north of Flagstaff, an extinct volcano cone and a lava-trail hike are beautiful yet eerie reminders of the brutal forces of nature. Why go: Some 900 years ago, a volcanic eruption spewed lava and ...

Volcanic cones are among the simplest volcano formations. They are built by fragments (called ejecta) thrown up (ejected) from a volcanic vent, piling up around the vent in the shape of a cone with a ...