GEOLOGY

Detailed explanation-1: -Mount St. Helens, located in Washington State, is the most active volcano in the Cascade Range, and it is the most likely of the contiguous U.S. volcanoes to erupt in the future.

Detailed explanation-2: -Sitting about 97 miles south of Seattle and 52 miles northeast of Portland, Oregon, Mount St. Helens is the most active volcano within the Cascade Range and has the highest probability out of all U.S. volcanoes other than Hawaii and Alaska to erupt in the future.

Detailed explanation-3: -Helens erupts. At 8:32 a.m. PDT on May 18, 1980, Mount St. Helens, a volcanic peak in southwestern Washington, suffers a massive eruption, killing 57 people and devastating some 210 square miles of wilderness.

Detailed explanation-4: -The eruption of the Hunga-Tonga-Hunga-Ha’apai volcano on 15 January 2022 was the largest recorded since the eruption of Krakatoa in 1883. The eruption triggered tsunami waves of up to 15m which struck the west coast of Tongatapu, ‘Eua and Ha’apai.

Detailed explanation-5: -Which volcanoes in the conterminous United States have erupted since the Nation was founded? Excluding steam eruptions, these volcanoes have shown activity: Mount St. Helens, Washington-Eruptions and/or lava dome growth occurred in the late 1700s, 1800-1857, 1980-1986, and 2004-2008.