The word can be utilized synonymously with "volcanic ash." It can be mined from volcanic ash deposits, or it could be made by crushing rock pumice. Porosity: Pumice is highly porous, with nearly 90% of its volume consisting of vacant Areas, rendering it a great substance for h2o retention in https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/