If you hammered a nail into pumice what would happen Into granite?

Well, if you hammered a nail into pumice, the nail would probably just sink right in like a hot knife through butter. Pumice is so porous and lightweight, it wouldn't offer much resistance. Now, if you tried hammering a nail into granite, good luck with that! Granite is tough as nails (pun intended), so that nail would likely bend or break before making much of a dent.