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The entire ocean, containing 97% of Earth's water, spans 70.8% of Earth's surface, [8] making it Earth's global ocean or world ocean. [23] [25] This makes Earth, along with its vibrant hydrosphere a "water world" [43] [44] or "ocean world", [45] [46] particularly in Earth's early history when the ocean is thought to have possibly covered Earth ...
Most water in Earth's atmosphere and crust comes from saline seawater, while fresh water accounts for nearly 1% of the total. The vast bulk of the water on Earth is saline or salt water, with an average salinity of 35‰ (or 3.5%, roughly equivalent to 34 grams of salts in 1 kg of seawater), though this varies slightly according to the amount of runoff received from surrounding land.
The length of 50 metres (164 ft) must be between the touch pads at the end of each lane, if they are used. [3] If starting blocks are used, then there must be a minimum depth of 1.35 metres (4.4 ft) from between 1 metre (3 ft 3 in) from the end of the pool to at least 6 metres (19 ft 8 in) from the end of the pool.
Most of Earth's surface is ocean water: 70.8% or 361 million km 2 (139 million sq mi). [97] This vast pool of salty water is often called the world ocean, [98] [99] and makes Earth with its dynamic hydrosphere a water world [100] [101] or ocean world. [102] [103] Indeed, in Earth's early history the ocean may have covered Earth completely. [104]
Strictly speaking, a sea is a body of water (generally a division of the world ocean) partly or fully enclosed by land, [4] though "the sea" refers also to the oceans. Saline water covers approximately 361,000,000 km 2 (139,000,000 sq mi) and is customarily divided into several principal oceans and smaller seas, with the ocean covering ...
The lake covers nearly 14,000 acres (57 km 2) with 190 miles (310 km) of shoreline touching three counties. [6] The lake is an average of 23 feet (7.0 m) deep with an estimated volume of 1.35 × 10 10 cubic feet (3.82 × 10 8 m 3 ).
In 1912 (113 years ago) () a 72 ft (22 m) multiple arch dam was constructed about 300 ft (91 m) downstream of the old dam and increased the lake capacity to 73,000 acre-feet (90,000 dam 3). The original granite dam still remains, usually under about 20 feet of water. A highway bridge (SR 18) was built over the arches of the new dam in 1923.
This is enough water to cover the 48 contiguous U.S. states to a uniform depth of 9.5 feet (2.9 m). Although the lakes contain a large percentage of the world's fresh water, the Great Lakes supply only a small portion of U.S. drinking water on a national basis. [50]