Popocatépetl Volcano, Mexico — In the predawn darkness, a team of scientists climbs the slope of Mexico's Popocatépetl volcano, one of the world’s most active and whose eruption could affect millions ...
The Iliamna Volcano in Alaska is more than 10,000 feet (3,053 meters) above Cook Inlet, and recently, it has been active. The volcano felt tremors from the signature of avalanches big enough to ...