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RT @USGSVolcanoes: An eruption 43 yrs ago dramatically changed the landscape at #MountStHelens. This new poster takes you on a journey of t…
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RT @USGSVolcanoes: An eruption 43 yrs ago dramatically changed the landscape at #MountStHelens. This new poster takes you on a journey of t…
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RT @AZGeology: A brief overview of the eruptive history of Mount St. Helens’, from the onset of volcanic activity about 272,000 years ago…
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A brief overview of the eruptive history of Mount St. Helens’, from the onset of volcanic activity about 272,000 years ago to the present. An excellent and informative recounting of a “Land in Transformation”. Well done US Geological Survey staff. htt