The Importance Of Water

Earth's liquid water makes it unique in the solar system. It's also a primary culprit in causing potholes.

A case could be made this colorless, odorless liquid is the most important substance on Earth.  Without water there is no life as we know it.  When we explore off planet it’s the first thing we look for. 

Considering two thirds of the Earth is covered in water there’s probably less of it than you think.  If you took all the water on Earth, in the atmosphere and beneath the ground you’d get a blob with an 860 mile diameter.

Subtract what’s in the ocean the blob shrinks to 169 miles in diameter.