Klyuchevskoy volcano in Russia erupted shortly after a powerful 8.8 magnitude earthquake in the same region. When you purchase through links on our site, we may earn an affiliate commission. Here’s ...

One of the most explosive volcanoes in U.S. history began its eruption with a trickle, not a blast. Mount St. Helens' gas-laden magma oozed into the cone before the mountain finally erupted in 1980.