Highly vesicular volcanic ejecta, typically silicic in composition. It is essentially magma that has been frothed up by escaping gases and then cooled and solidified during eruption. Rhyolitic pumice is typically of low enough density that it floats on water. Near a vent, hot pumice can accumulate and form a pumice cone.
20/02/2019 7:17:00 Pumice Pumice
Tags: ScienceCategorised in: Uncategorized