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
Middle-earth objects Númenor's eastern coast. She sometimes sailed to other harbours around Númenor. In the spring of the first ship from Númenor reached Middle-earth. This ship was "Entulessë" (Return), and she was commanded by Vëantur, the Captain of the King's Ships under Tar-Elendil, the fourth king of Númenor. In Middle-earth "Entulessë" landed in the Grey Havens, where Vëantur initiated Númenor's friendship with Gil-galad, the King of the High Elves. Vëantur subsequently made further expeditions to Middle-earth, eventually using the ship "Númerráma". "Hirilondë" (Haven-finder) was the largest ocean-going ship built by Aldarion. The vessel was constructed in the shipyards of Rómenna, the great