November 9, 2010--Our wet planet: How did it come to be so blue? (Washington Post)

Imagine you own a gigantic swimming pool that's a thousand miles long and a thousand miles wide. Now imagine you decided to pour all of the world's oceans, lakes and rivers into your pool. It had better be about 333 miles deep (all the way across - no shallow end) to accommodate all that water. In other words, there's a reason the Earth is called the blue planet: It's covered in a lot of H2O.

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