THEMATIC VOLCANO PHOTO GALLERY:
- Accretionary lapilli -
Accretionary lapilli in an ash deposit on Santorini.
Accretionary lapilli are small spherical balls of volcanic ash that form from a wet nucleus falling through a volcanic ash cloud. They can flatten on hitting the ground or may roll on loose ash and grow like a snowball.
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© Tom Pfeiffer, page set up on 2 June, 2005.