M'zaka zaposachedwapa, ulusi wa basalt waonekera ngati chinthu chodziwika bwino, chomwe chikukopa chidwi cha mafakitale padziko lonse lapansi. Ulusi watsopanowu, womwe umachokera ku miyala yosungunuka ya basalt, uli ndi zinthu zapadera, kuphatikizapo mphamvu yolimba, kukhazikika kwa kutentha, komanso kukana dzimbiri. Zotsatira zake, ntchito zake zimafalikira m'magawo osiyanasiyana, kuyambira zomangamanga ndi zamagalimoto mpaka ukadaulo wa ndege ndi zachilengedwe. Lero, tikuyang'ana kuthekera kosintha kwa ulusi wa basalt ndi tsogolo lake labwino popanga mafakitale amakono.