Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
Pumice is a volcanic rock that is very light and porous. It contains hollow vesicles which contain volcanic gasses formed during the eruption. This makes the rocks buoyant enough to be able to float on the surface of the sea until the gas leaches out and water gets in, at which time they will sink to the bottom of the ocean.
