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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 Great Lakes contain 21% of the world's surface fresh water: 5,472 cubic miles (22,810 km 3), or 6.0×10 15 U.S. gallons, that is 6 quadrillion U.S. gallons, (2.3×10 16 liters). The lakes contain about 84% of the surface freshwater of North America; [ 48 ] if the water were evenly distributed over the entire continent's land area, it would ...
World map of countries by their raw ecological footprint compared against the global average biocapacity of 2.1 gha per person in 2007. List of countries by carbon dioxide emissions per capita; Sustainable development; List of countries by inequality-adjusted Human Development Index; Peak water, water resources and water withdrawal
The ocean is the body of salt water that covers approximately 70.8% of Earth. [8] In English, the term ocean also refers to any of the large bodies of water into which the world ocean is conventionally divided. [9]
The average total lung capacity of an adult human male is about 6 litres of air. [1] Tidal breathing is normal, resting breathing; the tidal volume is the volume of air that is inhaled or exhaled in only a single such breath. The average human respiratory rate is 30–60 breaths per minute at birth, [2] decreasing to 12–20 breaths per minute ...
Although promoted as the "Land of 10,000 Lakes", Minnesota has 11,842 lakes of 10 acres (4.05 ha) or more. [1] The 1968 state survey found 15,291 lake basins, of which 3,257 were dry. [ 2 ] If all basins over 2.5 acres were counted, Minnesota would have 21,871 lakes. [ 3 ]
A 2016 investigation by the U.S. Geological Survey found unusually high concentrations of perchlorate in the surface water and groundwater of the area. [77] A sample collected from a stream had a maximum perchlorate concentration of 54 micrograms per liter, roughly 270 times higher than samples taken from locations outside the area. [ 78 ]
In 1884 marshy, nearly flat Bear Valley was dammed with a single arch granite impoundment, which held back some 25,000 acre-feet (31,000 dam 3) of water for irrigation purposes in the Redlands area. Redlands citrus growers found that the 1884 dam produced insufficient water.