The dents in the Moon are called craters, they were caused by smaller rocks hitting the Moon. Most of the craters in the Moon were formed more than a billion years ago when the Solar System was very young
For an interesting follow up, you can look up pictures of the far side of the moon (we only ever see one side of the moon from Earth since it’s ‘tidally locked’ to us), which has many more craters than the near side
The dents are craters formed by the impact of rocks of the surface of the Moon. As there are no volcanoes on the Moon, the surface isn’t refreshed regularly and the dents stay there. You can actually see craters on Earth too as we are occasionally hit by big enough rocks to make dents!
Try dropping some large stones into a smoothed sandpit. When you carefully pick up the stones, you’ll see that impact craters are left behind. That’s how the dents are formed on the moon.
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Martin McMahon commented on :
Try dropping some large stones into a smoothed sandpit. When you carefully pick up the stones, you’ll see that impact craters are left behind. That’s how the dents are formed on the moon.