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
Fridtjof Nansen in January 1913 he received news of the suicide of Hjalmar Johansen, who had returned in disgrace from Amundsen's successful South Pole expedition. In March 1913, Nansen's youngest son Asmund died after a long illness. In the summer of 1913, Nansen travelled to the Kara Sea, by the invitation of Jonas Lied, as part of a delegation investigating a possible trade route between Western Europe and the Siberian interior. The party then took a steamer up the Yenisei River to Krasnoyarsk, and travelled on the Trans-Siberian Railway to Vladivostok before turning for home. Nansen published a report from the trip