Something Is Happening Beneath America's 10 Most Dangerous Volcanoes

In this video, we explore America’s 10 most dangerous volcanoes and the unsettling signs that some of them may be showing renewed activity beneath the surface. From Mount Hood and Mount Rainier to Yellowstone and Alaska’s Mount Spurr, scientists continue to monitor earthquake swarms, gas emissions, ground deformation, and rising underground heat that can signal changes deep within volcanic systems. Discover how past eruptions reshaped entire landscapes, why lahars can be more dangerous than lava, and how volcanic ash can disrupt cities, aviation, water supplies, and infrastructure hundreds of miles away. We also examine the unique risks posed by lesser-known threats like Glacier Peak and Long Valley Caldera, along with the challenges scientists face when trying to predict future eruptions. Which volcano poses the greatest threat to the United States—and could the next eruption come from a mountain most people rarely think about? This countdown explores the science, history, and risks behind some of North America’s most powerful geological forces.

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00:00 Introduction to US volcanoes
02:03 Mount Hood
04:46 Mount St. Helens
08:04 Mount Rainier
11:29 Yellowstone supervolcano
14:51 Mount Shasta
15:56 Mount Spurr
18:48 Long Valley Caldera
20:06 Kilauea
21:16 Glacier Peak
22:24 The restless Pacific chain

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