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The total volume of water on Earth is estimated at 1.386 billion km 3 (333 million cubic miles), with 97.5% being salt water and 2.5% being freshwater. Of the freshwater, only 0.3% is in liquid form on the surface. [2][3][4] Because the oceans that cover roughly 70.8% of the area of Earth reflect blue light, Earth appears blue from space, and ...
Fresh water can easily become polluted by human activities or due to naturally occurring processes, such as erosion. Fresh water makes up less than 3% of the world's water resources, and just 1% of that is readily available. About 70% of the world's freshwater reserves are frozen in Antarctica. Just 3% of it is extracted for human consumption.
Freshwater ecosystems are a subset of Earth's aquatic ecosystems. They include lakes, ponds, rivers, streams, springs, bogs, and wetlands. [1] They can be contrasted with marine ecosystems, which have a larger salt content. Freshwater habitats can be classified by different factors, including temperature, light penetration, nutrients, and ...
It is the lowest freshwater lake on Earth and the second-lowest lake in the world (after the Dead Sea, a salt lake), [3] with its elevation fluctuating between 215 and 209 metres (705 and 686 ft) below sea level (depending on rainfall). [4] It is approximately 53 km (33 mi) in circumference, about 21 km (13 mi) long, and 13 km (8.1 mi) wide.
This is a list of freshwater ecoregions as compiled by the World Wildlife Fund (WWF). The freshwater ecoregion system is similar to that for terrestrial ecoregions . The Earth's land surface is divided into eight terrestrial biogeographic realms or ecozones, which contain hundreds of smaller ecoregions.
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; [ 47 ] if the water were evenly distributed over the entire continent's land area, it would ...
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House of Cards is an American political thriller television series created by Beau Willimon. It is based on the 1989 novel of the same title by Michael Dobbs and an adaptation of the 1990 British series of the same name by Andrew Davies, also from the novel. The first 13-episode season was released on February 1, 2013, on the streaming service ...