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Title: DEBRIS AVALANCHE AND ASH CLOUD
Caption: (b) Path of the ash cloud (orange) from the 1980 eruption. Area covered by at least 5 mm (0.2 in.) is shown in red in the upper-left corner. (Data from various U.S. Geological Survey publications)
Keywords: volcanoes, volcanism, volcanic eruptions, lavas, composite cones, stratovolcanoes, Cascade Range, Cascades, Mount St. Helens, pyroclastic, pyroclastics