You never know, somewhere in the world there might be a small rock containing a mineral compound or elementary isotope that wasn't previously known to occur naturally.,(reply>), @Trash Panda we should dig up the rainforest looking for this new discovery,(reply>), TBH most of the Earth we don't know what its made from. The deepest minerals/rocks we've found are diamond inclusions (now at the surface) but they're only from a few 100km down. The mantle which stretches down 3000km is all made of rock and we have no idea what let alone the inner core. There are theories but we don't and probably won't ever be able to go down an visit to be sure.,(reply>), Save the Rain forest and find out.,(reply>), @Corzappy The last one 🤣,(reply>), Or at the bottom of the ocean an incredibly rare species of animal containing a chemical compound that can reverse biological aging or cure cancer or make you bust a nut upon contact, y'know something really incredible.