This is an image found on BoingBoing.com. The two spheres superimposed on the earth images are comparisons of water quantity (on left) and air quantity (on right) with the earth itself. The comparison is made to deomstrate the limited amount of air and water our planet actually has to sustain life.To read more vist the following link.
All the water and air on earth gathered into spheres - BoingBoing.com
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