This passage provides a compelling resource for teaching about volcanoes, particularly Mount St. Helens, by illustrating the powerful and ongoing impact of volcanic mudflows, or lahars. It details how the 1980 eruption triggered massive, fast-moving mudflows by rapidly melting snow and glacier ice, highlighting their destructive force as they carried debris, trees, and even vehicles downstream. The text also connects Mount St. Helens to other volcanic events, such as the deadly 1985 Nevado del R