Mount St. Helens is a master of disguises, adept at sending out false clues. Can anyone figure out what's going on with this active volcano in Washington State? This illustrated book presents a wealth of easily digested information — covering underground gases, earthquakes, infrared measurements, bumps on earth's surface, and other factors — to help the budding Sherlock Holmes crack the case. With sidebars about the latest gadgets and gizmos, youngsters learn about volcanology while having fun.
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