1,098 followers
RT @USGS_Pubs: New #USGS field-trip guide for exploring pyroclastic density current deposits from 1980 eruption of Mount St. Helens https:/…
RT @USGS_Pubs: New #USGS field-trip guide for exploring pyroclastic density current deposits from 1980 eruption of Mount St. Helens https:/…
New #USGS field-trip guide for exploring pyroclastic density current deposits from 1980 eruption of Mount St. Helens https://t.co/3NXDbVe6gQ https://t.co/VXE2CljXRq