What is the size of a small and large crater?

The earth has an atmosphere which can burn up any Rocks or Comets (anything from space ) that enter .. so less gets to the surface.. :D the moon does not have this ..

The earth has wind and rain and plants to break up and hide the craters. No wind on the moon means the craters stay perfect for thousands of years, or until another crater covers it. And there used to be more space rocks in this neighbourhood in the old days.