pumice

They had also visited Pompeii, the ancient Italian city buried under volcanic ash and pumice when Mt.

A wide residential and commercial block, known as "Region 9", is being cleared of several metres of overlying pumice and ash thrown out by Vesuvius almost 2,000 years ago.

In addition to lava, volcanos eject large amounts of pumice, ashes and gases as a fast-moving flow, known as "pyroclastic flow," and its sediments are a valuable data source on past eruptions.

Stocker says, “There are other green companies in Seattle that won’t clean ovens because they believe there is no eco-friendly option. But there is and we clean them every day: pumice stone.”

A small ship called “Olive” came across “ribbons” of pumice on the sea’s surface.