That's a good question!It turns out all of those "holes" are really just big dents from when other things in space have crashed into it.
The earth has an atmosphere which, aside from making it possible for us to live here, protects us from these things. Most things from space that come close to hitting the earth burn up in our
atmosphere. The moon doesn't have an atmosphere, so there's nothing to protect it. Also, since there is no wine or water on the moon, there's nothing to make these craters wear away, so they stay as pronounced as the day they were formed.
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