Our water is this precious

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Our water is this precious

May 29, 2012 - 22:20
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The drawings below show various blue spheres representing relative amounts of Earth's water in comparison to the size of the Earth. The blue sphere shown encapsulates “all the water in the oceans, seas, ice caps, lakes and rivers as well as groundwater, atmospheric water, and even the water in you, your dog, and your tomato plant”, says the U.S. Geological Survey (USGS).

How much water is on Earth?

These images attempt to show three dimensions, so each sphere represents "volume." Overall, it shows that in comparison to the volume of the globe the amount of water on the planet is very small - and the oceans are only a "thin film" of water on the surface.

The largest sphere represents all of Earth's water, and its diameter is about 1385km (860 miles). It would have a volume of about 1,386,000,000 cubic kilometers (km3) (332,500,000 cubic miles (mi3)).

Fresh water

The "tiny" bubble over Atlanta, Georgia represents fresh water in all the lakes and rivers on the planet, and most of the water people and life of earth need every day comes from these surface-water sources.

The volume of this sphere is about 93,113 km3 (22,339 mi3). The diameter of this sphere is about 56.2 kilometers (34.9 miles ). Yes, Lake Michigan looks way bigger than this sphere, but you have to try to imagine a bubble 56km (almost 35 miles) high—whereas the average depth of Lake Michigan is less than 91 meters (300 feet ).

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