The vast majority of space rocks crashing down towards Earth is vaporised into dust by the immense temperatures generated by the friction with the atmosphere. Pieces rarely reach the Earth's surface and they're usually tiny if they do. That being said bigger meteorites do impact the Earth, like the one in Russia a few years ago, usually though they fall into the ocean.

There are craters on the Earth too, it's just that most of them are not easily visible since they're usually overgrown with trees and plants. By contrast the moon has no atmosphere or an active eco system so not only does it get a lot more impacts but all the craters are very easy to see.