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https://t.co/XChCButBSA Fascinating article about the magmatic progression of Mount St. Helens prior to 1980!! @MtStHelensWA #Volcano #Washington #Cascades #MtStHelens #Magma #Ash
https://t.co/XChCButBSA Fascinating article about the magmatic progression of Mount St. Helens prior to 1980!! @MtStHelensWA #Volcano #Washington #Cascades #MtStHelens #Magma #Ash