VolcanoesBy: Gail Gibbons Rumbling, hissing, shaking. . . a volcano is about to erupt! Learn all about volcanoes, from tectonic plates to what do when there is a volcanic warning, in this primer for young readers. Did you know there are four main types of volcanoes? Or that volcanoes are classified as active, dormant, or extinct? The Devils Tower in Wyoming is an extinct volcano. Its about 40. 5 million years old! Gail Gibbons explores the hows and whys of
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