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Volcanic Ash Blown by Helicopter Mt St. Helens

Credit: Lyn Topinka, USGS
Blog: Volcanic Destruction Not Always Caused By Lava 		Other images from this article
Pyroclastic Flow Mt St Helens Lahar From Mt St Helens Pyroclastic Flow Mt St Helens Crater Volcanic Ash Blown by Helicopter Mt St. Helens
Volcanic Ash Blown by Helicopter Mt St. Helens, Lyn Topinka, USGS