N'ihe dị ka kilomita 100 n'ime omimi, agbaze na-eme na nkume dị n'elu slab (n'ihi mgbakwunye nke mmiri), ma na-etolite magma nke ruru n'elu. Mgbe magma ruru n'elu, ọ na-ewu ugwu mgbawa, dị ka ugwu mgbawa ọta ma ọ bụ stratovolcano. Ihe atụ nke ugwu mgbawa gụnyere Ugwu Fuji na Japan na Ugwu Pinatubo na Philippines. Ọ dịghị mkpa ka magma rute n'elu ugwu iji mepụta ugwu: nke na-eme ka ụwa sie ike n'okpuru ala ka nwere ike ịmepụta ugwu dome, dị ka Navajo Mountain na US. Ajụjụ: Gịnị bụ ugwu mgbawa na Japan?
Ugwu Fuji