Gilbert and Ellice Islands Gilbert and Ellice Islands The Gilbert and Ellice Islands were a British protectorate from 1892 and colony from 1916 until 1 January 1976, when the islands were divided into two colonies which became independent nations shortly after. A referendum was held in December 1974 to determine whether the Gilbert Islands and Ellice Islands should each have their own administration. As a consequence of the referendum, the Gilbert and Ellice Islands colony ceased to exist on 1 January 1976 and the separate countries of Kiribati and Tuvalu came into existence. The Gilbert Islands (formerly "Kingsmill Islands") are a chain of sixteen
Geology of the Pacific Ocean Geology of the Pacific Ocean The Pacific Ocean evolved in the Mesozoic from the Panthalassic Ocean, which had formed when Rodinia rifted apart around 750 Ma. The first ocean floor which is part of the current Pacific Plate began 160 Ma to the west of the central Pacific and subsequently developed into the largest oceanic plate on Earth. The tectonic plates continue to move today. The slowest spreading ridge is the Gakkel Ridge on the Arctic Ocean floor, which spreads at less than , while the fastest, the East Pacific Rise near Easter Island, has a spreading rate of over