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 and after two false starts, Nansen and Johansen began their journey on 14 March 1895. Nansen allowed 50 days to cover the to the pole, an average daily journey of . After a week of travel, a sextant observation indicated they averaged per day, which put them ahead of schedule. However, uneven surfaces made skiing more difficult, and their speeds slowed. They also realised they were marching against a southerly drift, and that distances travelled did not necessarily equate to distance progressed. On 3 April, Nansen began to doubt whether the pole was attainable. Unless their speed improved, their food