May 18, 2020 marks the 40th anniversary of the 1980 eruption of Mount St. Helens. Yet, how did this eruption compare to other eruptions in the lifespan of this volcano? How old is Mount St. Helens? How frequently has Mount St. Helens erupted in the past? Learn about important milestones in the eruptive history of Mount St. Helens through our interactive timeline activity.
Grades: K-5 (learners of all ages are welcome!)
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