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because the moon does not contain enough gravity
I think that the earth does have a water supply since it has oxygen and gravity. On the moon I think it doesn't have oxygen or gravity. I'm not sure. This answer was just a guess.
Liquid water
The Moon does not have enough gravity to form a thick atmosphere. Intense sunlight reaches and heats the surface. Liquid water would be ionized and escape back into space as hydrogen and oxygen ions. The water on the Moon is in the form of ice in deep crater shadows. Sunlight cannot reach this ice to melt and vaporize it.
The moon is much too small to support an atmosphere - and thu any water that could exist on the surface would simply boil away into space.
because the moon does not contain enough gravity
I think that the earth does have a water supply since it has oxygen and gravity. On the moon I think it doesn't have oxygen or gravity. I'm not sure. This answer was just a guess.
Liquid water
On the earth there is air. There is no air on the moonAir, liquid water (There actually is frozen water on the Moon), life, Almost everything.On Earth, you can find liquid water, a substantial atmosphere, and lifeforms.
Liquid water
The Moon does not have enough gravity to form a thick atmosphere. Intense sunlight reaches and heats the surface. Liquid water would be ionized and escape back into space as hydrogen and oxygen ions. The water on the Moon is in the form of ice in deep crater shadows. Sunlight cannot reach this ice to melt and vaporize it.
The Moon does not have enough gravity to form a thick atmosphere. Intense sunlight reaches and heats the surface. Liquid water would be ionized and escape back into space as hydrogen and oxygen ions. The water on the Moon is in the form of ice in deep crater shadows. Sunlight cannot reach this ice to melt and vaporize it.
There is no liquid water on the moon. There is some evidence that there is frozen water.
The Moon does not have enough gravity to form a thick atmosphere. Intense sunlight reaches and heats the surface. Liquid water would be ionized and escape back into space as hydrogen and oxygen ions. The water on the Moon is in the form of ice in deep crater shadows. Sunlight cannot reach this ice to melt and vaporize it.
The vapor form, the liquid form, and the solid form are.
The Moon does not have enough gravity to form a thick atmosphere. Intense sunlight reaches and heats the surface. Liquid water would be ionized and escape back into space as hydrogen and oxygen ions. The water on the Moon is in the form of ice in deep crater shadows. Sunlight cannot reach this ice to melt and vaporize it.
There is no planet in the solar system which has more water than earth. Europa (a moon of the planet Jupiter) is thought to have a liquid ocean under a mantel of ice, but this moon is no larger than our own moon.