Ad: Volcanic Explosivity Index (VEI) T-Shirt
Showcase your geological sense of humor with any of these educational gifts featuring the volcanic explosivity index (VEI). Includes examples such as Mount St. Helens and the Yellowstone Caldera in perspective. Make others do a double-take at the major volcanic events in geological history that have shaped Earth. Memorable gifts for all earth scientists and fans of volcanoes! myEarthScience
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