Bonin Islands Pacific Plate is subducting under the Philippine Sea Plate, which creates an oceanic trench to the east of the islands: the Bonin Trench. The crust of the Ogasawara Islands was formed by volcanic activity when subduction began 45–50 million years ago, and is composed mostly of an andesitic volcanic rock called boninite, which is rich in magnesium oxide, chromium, and silicon dioxide. The Ogasawara Islands may represent the exposed parts of an ophiolite that has not yet been emplaced on oceanic crust. The rocks of the Volcano Islands are much younger; Iwo Jima is a dormant volcano characterized by rapid
Volcano and Ryukyu Islands campaign mission, and the battleship was destroyed before it could engage the US navy. Control of the Volcano and Ryukyu Islands enabled the US Army Air Forces to conduct missions against targets on Honshu and Kyushu, with the first raid occurring on Tokyo, from March 9–10. Volcano and Ryukyu Islands campaign The Volcano and Ryūkyū Islands Campaign was a series of battles and engagements between Allied forces and Imperial Japanese forces in the Pacific Ocean campaign of World War II between January and June, 1945. The campaign took place in the Volcano and Ryukyu island groups. The two main land battles