Why does the surface of the moon remain virtually unchanged by weathering? 


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Samuel Chiltern Profile
Samuel Chiltern answered
There is no weather on the Moon, for the simple reason that there isn't really any atmosphere. In everyday terms, astronomers generally consider the Moon to be surrounded by a vacuum - space in other words.

Because there is no weather, there is also no weathering, and the erosive properties of the wind and rain cycle cannot be replicated on the Moon.

We've yet to prove that any water even exists there at all. We know for a fact that any water vapour on the Moon would escape very quickly, so the only possibility is that there is water locked away in ice, but we haven't found any yet.

The Moon retains its craters from a multitude of impacts with other astronomical bodies, like battle scars that will never heal. It also still bears the footprints of the few men who've made it up to the surface from Earth.

The Moon and its Extremely Fine Atmosphere
The space that exists between planets, outside of any atmosphere, is extremely barren. However, by comparison, it is still possible to find a greater density of particles in close proximity to the Moon. This is referred to as the lunar atmosphere, but in practical terms, it accounts for very little indeed.

The Moon releases gases as a result of the radioactive decay that occurs within its crust and mantle, and also attracts small-scale debris from space, including micrometeorites and the solar wind emitted from the Sun.

Often, however, the material that builds up is swept away by solar winds, or escapes of its own accord - so the Moon never has a chance to build up any substantial atmosphere.
Anonymous Profile
Anonymous answered
For any weathering process to happen, there needs to be an agent of weathering, which is usually water and/or wind. But the moon has neither, hence it is unchanged (as of now, as scientists are still searching for evidence of water on the moon).

The moon is not like the Earth. The Earth is teeming with weathering processes both physical and chemical, not to mention erosion and mass wasting/movement. Therefore the Earth's surface is ever-changing.

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