What scientists have learned from Mount St. Helens’ devastating eruption, 45 years later

PBS News Hour - Segments

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. John Yang looks back at the deadliest and most destructive volcanic eruption in U.S. history with Steve Olson, author of “Eruption: The Untold Story of Mount St. Helens.” PBS News is supported by - https://www.pbs.org/newshour/about/funders