Cascade Volcanic ArcTopic:

 On May 18, 1980, in Washington state, Mount St. Helens volcano exploded leaving 57 people dead or missing. This was a Plinian eruption. It validated Pliny the Younger’s eyewitness description, often regarded as exaggeration, of the Vesuvius explosion that buried Pompeii and Heraculaneum. Mount…

On This Day in 1902, Crater Lake National Park was established. As the deepest lake in the United States of America – 592 m (1943 ft) – it is actually the remaining cauldron or caldera of an ancient volcano called Mount Mazama that exploded…