PUMICE

noun
12 Scrabble
16 WWF
P 3
U 1
M 3
I 1
C 3
E 1

Definition

A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into water or air as a froth containing masses of gas bubbles. As the lava solidifies, the bubbles are frozen into the rock.

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