Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Kupfuura: Chitarisiko chakajeka chaIo mugumisiro wezvinhu zvakaiswa nokuita kwayo makomo, kubatanidza silicates (zvakadai seorthopyroxene), sulfur, uye sulfur dioxide. Sarufa yakasviba inogara iripo pose pose pamusoro peIo, ichiumba nzvimbo huru dzakafukidzwa nezvinhu zvichena kana kuti zvitsvuku. Sarufa inoonekwawo munzvimbo dzakawanda muIo, ichigadzira nzvimbo dzeruvara rwegirini kusvika kuruvara rwegirini. Sarufa inochengeterwa munzvimbo dzapakati-kati uye dzomumakomo inowanzokuvadzwa nemwaranzi, ichiputsa sarufa ine maketani masere inowanzova yakagadzikana. Uku kukuvadzwa nemwaranzi kunogadzira nharaunda dzepolar dzeIo dzine ruvara rutsvuku-rwebhuruu.  Mubvunzo: Rudzii rwekukuvadzwa runoita kuti zvikamu zveIo zvive zvitsvuku nezvishava?
mwaranzi