Gilbert and Ellice Islands their own administration. As a consequence of the Ellice Islands self-determination referendum, 1974, separation occurred in two stages. The Tuvaluan Order 1975 made by the Privy Council, which took effect on 1 October 1975, recognised Tuvalu as a separate British dependency with its own government. The second stage occurred on 1 January 1976 when two separate administrations were created out of the civil service of the Gilbert and Ellice Islands Colony. The British conducted a formal inquiry into Tuvaluan attitudes towards secession, and announced that a referendum was to be held, in which Tuvaluans could choose to remain with the
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