SIA3684: Accretionary Lapilli from the 1790 Explosive Eruption

Photographer:Calvin J. Hamilton
Copyright:Copyright © 2010 Calvin J. Hamilton
Location:Hawaii Volcanoes National Park

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These pea-sized fragments form when fine ash coalesces around small nuclei of rock fragments or raindrops within steam-laden explosion clouds. Because they form in turbulent clouds and fall to the earth's surface, accretionary lapilli have been called volcanic hailstones.

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