The phrase can be employed synonymously with "volcanic ash." It is actually mined from volcanic ash deposits, or it can be produced by crushing rock pumice. Porosity: Pumice is extremely porous, with as many as ninety% of its quantity consisting of vacant spaces, making it a superb content for h2o https://bookmarkalexa.com/story4972469/an-unbiased-view-of-pumice-stone-suppliers