Pumice Cones - John Seach

A pumice cone is a structure similar to a cinder cone but made up of volcanic glass fragments
so filled with gas-bubble holes that it resembles a sponge and is very lightweight; pyroclastic cone,
a cone-shaped volcano composed almost entirely of pyroclastic material.

Example of Pumice Cone
Tullu Moje volcano in Ethiopia.
 

Pumice cone
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