 Complete the following phrase:  In April 1980, Voights publications on landslides, avalanches, and other mass movements attracted the attention of Rocky Crandell of the United States Geological Survey USGS, who asked him to look at a growing bulge on the Mount St. Helens volcano in the state of Washington. Voight foresaw the collapse of the mountains north flank as well as a powerful eruption. His predictions came true when St. Helens 