Describe a planet without water. What do you think would still be around and what would be missing?  

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pacorz | High School Teacher | (Level 3) Educator

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Virtually any scientist would predict that such a planet would be lifeless, because as far as we can tell, all life requires water in the liquid phase.

A waterless planet would, if it had an atmosphere at all, have a very different type of atmosphere than we are used to here on earth. There would be no precipitation, and the atmosphere would not be as good at absorbing and buffering temperature, so there would probably be large temperature swings between light and dark periods on the planet.

Without water, erosion would be different. There could still be erosion due to wind, but that tends to give different results. Also, without water to dissolve and transport soluble chemicals, the geology of the planet would be different; no stalagmites or stalactites, and few caves to have them in. No salt deposits, no sediments or sedimentary rocks, no channels or seas or canyons.

In my mind's eye I see a dry, lifeless planet with huge dust storms and a relatively uniform surface. Not a very welcoming place.

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