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Definition of sphere. 1a (1) : the apparent surface of the heavens of which half forms the dome of the visible sky (2) : any of the concentric and eccentric revolving spherical transparent shells in which according to ancient astronomy stars, sun, planets, and moon are setb : a globe depicting such a sphere; broadly : globe a.
These images attempt to show three dimensions, so each sphere represents volume. They show that in comparison to the volume of the globe, the amount of water on the planet is very small. Oceans account for 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. Its diameter is about 860 miles (the distance from Salt Lake City, Utah, to Topeka, Kansas) and has a volume of about 332,500,000 cubic miles (mi 3) (1,386,000,000 cubic kilometers (km 3)).