Some volcanoes threatened populations with torrents ... To revisit some of the worst volcanic disasters of the past 400 years, click on the image at left.—Susan K. Lewis ...

Earth harbors hundreds of active volcanoes. When they erupt ... Mount Pelée (1902) Death toll: 30,000 It’s considered the worst volcanic disaster of the 20th century. Krakatoa (1883) Death ...

West Iceland's volcano is a rift activity volcano, which involves the earth being pulled apart in two different directions ...