Mount St Helens ranked second biggest US volcanic threat
Source(s):
National Geographic Society
![Photo by Flickr user greatbeyond, Creative Commons Attribution 2.0 Generic](/sites/default/files/styles/landscape_16_9/public/13971_VolcanoStHelenagreatbeyon.jpg?itok=z2xdPSgT)
Photo by Flickr user greatbeyond, Creative Commons Attribution 2.0 Generic
Christine Dell'Amore reports on the proposed National Volcano Early Warning System, supported by several US volcano observatories which, if put in place, may ensure that the most dangerous US volcanoes are being monitored.
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Hazards
Volcano
Country and region
United States of America