Accretionary lapilli. Photos and brief explanation

THEMATIC VOLCANO PHOTO GALLERY:

- Accretionary lapilli -

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Accretionary lapilli in an ash deposit on Santorini.

Brief explanation:

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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