 What clue proves the natural existence of water on the moon?
By the light of this, he reinspected the steam system, and found about three gallons of water frozen in the condenser. This was to allow the air-conditioning system to function properly, and to prevent air loss in case of the highly improbable meteor damage. After the sun rose, Evans returned to the lava cave that he had been exploring when the meteor hit. All of these needed water to form, and their existence on the Moon puzzled him for a while. That's from here to Earth, of course. They claim that a radio that won't carry beyond the horizon isn't any good, and one that will bounce messages from Earth takes up too much room."
 The presence of specific minerals
 The ability to distill alcohol  Increase of meteor activity  Humans are able to survive for long periods of time  The presence of specific minerals