Photographer: Calvin J. Hamilton Copyright: Copyright © 2010 Calvin J. Hamilton Date: 2010/06/23 Location: Hawaii Volcanoes National Park

Related Documents

• Hawaii Volcanoes National Park
• SolarViews Hawaiiam Volcanoes

Download Options

Caption

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.