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Water, Water Everywhere?

But Wait, Doesn’t It Cover 70% of the Earth’s Surface?

But Wait, Doesn’t It Cover 70% of the Earth’s Surface?

The following item comes from the Astronomy Picture of the Day website, and it sets me to thinking. Even in drought-stricken California, we take water for granted. The picture above takes all the known water on earth and positions it as a single mega-drop over the arid Great Basin of the United States.

According to the text that accompanies it:

How much of planet Earth is made of water? Very little, actually. Although oceans of water cover about 70 percent of Earth’s surface, these oceans are shallow compared to the Earth’s radius. The featured illustration shows what would happen if all of the water on or near the surface of the Earth were bunched up into a ball. The radius of this ball would be only about 700 kilometers, less than half the radius of the Earth’s Moon, but slightly larger than Saturn’s moon Rhea which, like many moons in our outer Solar System, is mostly water ice. How even this much water came to be on the Earth and whether any significant amount is trapped far beneath Earth’s surface remain topics of research.

I’d hate to think that the moonlets around some of the outer planets of our solar system contain more drinking water than Planet Earth.

As the most interesting man on Earth has been known to say, “Stay thirsty, my friends!”