The surface texture of this large volcanic bomb suggests its name. Breadcrust bombs are produced when the surface of a newly ejected block cools and fractures while degassing inflates the still-hot interior. This roughly 1-m-wide breadcrust bomb was ejected onto the rim of Asama volcano in Japan.

Copyrighted photo by Katia and Maurice Krafft, 1981.

Copyrighted image used with permission. All Rights Reserved. Contact photographer for any usage requests.

Asamayama