This on-line book, published by the United States Geological Survey (USGS), covers the 1980 eruption of Mount St. Helens in Washington state. There is a discussion of the events leading up to the eruption, as well as an...

Email a USGS scientist your question on volcanoes, earthquakes, tsunamis, mountains, rocks, maps, ground water, lakes, rivers, even some biology. Explore the USGS website and the Frequently Asked Questions section to see...