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The violent eruption of Krakatau volcano in Indonesia threw 18 cubic kilometers of ash skyward. The blast was heard 5,000 kilometers away.
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Mount Pelee, a Caribbean volcano, spewed out a burning cloud of hot gas and Pyroclastic flows. The cloud killed 29,000 residents of St. Pierre, a city on the volcano's flank. Only two people survived.
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Today, a river in Alaska cuts through the thick layer of volcanic ash from the eruption of Mount Katmai.
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When Mount St. Helens in Washington exploded, it blasted one cubic kilometer of volcanic material skyward.
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Pinatubo in the Philippines spewed out huge quantities of ash that rose high into the atmosphere and burried nearby areas.
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Bulldozers constructed a wall against a scalding river of lava creeping down the slopes of Mount Etna in Sicily.
