system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't we have on Earth those funny craters present on almost every planet?

I mean, I just saw the brand new picture of Mercury from orbit, and they're all over the surface, just like every planet and moon in the Solar System. Or am I wrong?
gpt
Two factors: 

1. Earth's surface is geologically active, so older craters will eventually be buried or torn apart by tectonics.  
2. Earth has enough atmosphere, so there is more erosion to wipe out craters.  

And actually, not every planet or moon is heavily cratered, you don't see many craters on Venus, Io, Titan or Europa; and you don't see them at all on Jupiter, Saturn, Neptune or Uranus.