I saw this posted by another blogger but it was unclear what the largest drop of water actually represented. Many believed the large drop represented all of the world's fresh water, and no more. They were wrong.
The largest blue marble, the one over the American West, represents all the world's water: Period! Fresh water, salt water, water trapped in ice.
Here is the image that so grabbed my attention and the accompanying info from the
U.S. Department of the Interior.
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If the big bubble burst: If you put a (big) pin to the larger bubble showing total water, the
resulting flow would cover the contiguous United States (lower 48
states) to a depth of about 107 miles.
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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. Are you
surprised that these water spheres look so small? They are only small
in relation to the size of the 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.
Spheres representing all of Earth's water, Earth's liquid fresh water, and water in lakes and rivers
The largest sphere represents all of Earth's water, and its diameter
is about 860 miles (the distance from Salt Lake City, Utah, to Topeka,
Kansas). It would have a volume of about 332,500,000 cubic miles (mi
3) (1,386,000,000 cubic kilometers (km
3)).
The sphere includes all the water in the oceans, ice caps, lakes, and
rivers, as well as groundwater, atmospheric water, and even the water in
you, your dog, and your tomato plant.
Liquid fresh water
How much of the total water is fresh water, which people and many
other life forms need to survive? The blue sphere over Kentucky
represents the world's liquid fresh water (groundwater, lakes, swamp
water, and rivers). The volume comes to about 2,551,100 mi
3 (10,633,450 km
3),
of which 99 percent is groundwater, much of which is not accessible to
humans. The diameter of this sphere is about 169.5 miles (272.8
kilometers).
Water in lakes and rivers
Do you notice that "tiny" bubble over Atlanta, Georgia? That one
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 22,339
mi
3 (93,113 km
3). The diameter of this sphere is
about 34.9 miles (56.2 kilometers). Yes, Lake Michigan looks way bigger
than this sphere, but you have to try to imagine a bubble almost 35
miles high—whereas the average depth of Lake Michigan is less than 300
feet (91 meters).
The data used on this page comes from Igor Shiklomanov's estimate of global water distribution, shown in a table below.
Credit:
Howard Perlman, USGS; globe illustration by
Jack Cook, Woods Hole Oceanographic Institution (
©);
Adam Nieman.
Data source: Igor Shiklomanov's chapter "World fresh water resources" in
Peter H. Gleick (editor), 1993, Water in Crisis: A Guide to the World's
Fresh Water Resources (Oxford University Press, New York).