Basaltic magmas a Basaltic magmas are erupted by approximately 80 percent of volcanoes worldwide(the seafloor worldwide is mostly basalt) a Magma from Hawaiian volcanoes such as Kilauea and mauna loa is basaltic a The entire island of iceland is basalticBasaltic Magmas ◼ Basaltic magmas are erupted by approximately 80 percent of volcanoes worldwide (the seafloor worldwide is mostly basalt). ◼ Magma from Hawaiian volcanoes such as Kilauea and Mauna Loa is basaltic. ◼ The entire island of Iceland is basaltic