When the mountain blew, William Dilley was camping with neighbors some nine miles from Mount St. Helens. They thought they were safe, but the cloud of ash and debris kept approaching, and Dilley ...

The eruption produced a massive ash cloud that circled the Earth for 15 days. While volcanic eruptions can have a long-lasting impact on Earth’s temperature, Mount St. Helens’ eruption didn’t.

It was 45 years ago today when Mount St. Helens erupted, triggering the biggest landslide in Earth’s recorded history and creating an ash cloud that reached across the country.

Washington state's Mount St. Helens erupted with a force equivalent to as much as 50 megatons of TNT. The massive blast and subsequent landslides, flooding and ash cloud killed 57 people ...

Mount St. Helens, long known for its pretty silhouette ... into the air and sends boulders flying nearly 1,000 feet. A cloud of ash falls as far as 45 miles away. Eruptions occur every 30 minutes ...

“The smoke-gray cloud of ash and steam can be seen for miles, pulsating, churning and billowing from the sawed-off summit of Mount St. Helens,” he wrote. “Occasionally, lightning flashes ...

Tourists scrambled to get away from a volcanic eruption in Italy on June 2. Mount Etna, located on the eastern coast of Sicily and one of Europe's most active volcanoes, sent an ash cloud into the ...