略語大辞典 [Geo] 27 MORB mid-ocean ridge basalt 海中山脈玄武岩.mid-ocean ridge basalt; a type of rock inocean; e.g. DMM(depleted MORB mantle), a mantle end member of theearth; [Geo:Phys]. 丸善「略語大辞典」JLogosID : 11861501