Ocean smoothly into oceans of supercritical hydrogen. The atmosphere of Venus is 96.5% carbon dioxide, which is a supercritical fluid at its surface. On other bodies: Ocean An ocean () is a body of saline water that composes much of a planet's hydrosphere. On Earth, an ocean is one of the major conventional divisions of the World Ocean. These are, in descending order by area, the Pacific, Atlantic, Indian, Southern (Antarctic), and Arctic Oceans. The word "ocean" is often used interchangeably with "sea" in American English. Strictly speaking, a "sea" is a body of saline water (generally a division of the
Seagaia Ocean Dome of the resort. It was reopened in 2016 but closed and demolished in 2017. The Ocean Dome sported a simulated flame-spitting volcano, artificial sand and the world's largest retractable roof, which provided a permanently blue sky even on a rainy day. The air temperature was always held at around and the water at around . The roof of the structure was retractable in four sections. Seagaia Ocean Dome The , was one of the world's largest indoor waterparks, located in Miyazaki, Miyazaki, Japan. The Polynesia-themed Ocean Dome, which was a part of the Sheraton Seagaia Resort, measured 300 metres in