United States Army Air Forces in the South Pacific Area southern areas of the widely separated Seventh Air Force and independent units scattered in the South Pacific Area during the Solomon Islands campaign. As the war progressed, Thirteenth Air Force units moved into the South West Pacific theatre and coordinated their activities with Fifth as part of the Far East Air Forces, a new Command. COOK ISLANDS ELLICE ISLANDS FIJI ISLANDS NEW CALEDONIA NEW HEBRIDES ISLANDS NEW ZEALAND NORFOLK ISLAND SOCIETY ISLANDS SOLOMON ISLANDS Bougainville Island Buka Island Guadalcanal Island New Georgia Islands Russell Islands TONGA ISLANDS United States Army Air Forces in the South Pacific Area During World War
Geology of the Pacific Ocean Plate in the north, the Cocos Plate off today's Central America, and the Nazca and Phoenix Plates in the southern Pacific. Charles Darwin had proposed a theory of the slow subsidence of the ocean floor based on his studies of Pacific oceanic islands, seamounts (underwater volcanoes) and guyots (flat-topped seamounts). His observations have been verified and expanded in the development of plate tectonic theory. The tectonic plates continue to move today. The slowest ridge spreading rate is across the Gakkel Ridge in the Arctic Ocean which separates at less than 2.5 cm/yr while the fastest, across the East Pacific Rise