Re: The cratered Earth
the late heavy bombardment peppered the planet quite thoroughly but in 3-4 billion years since then most of the crust has been recycled except for a few places like Greenland.
Not so much. The world as a whole bears plenty of evidence of meteor strikes. To quote someone who knows a lot more about it than I:
"If you didn’t know better, you’d suspect meteors were targeting Australia, North America and Europe. It’s not that there are so many craters there, it’s that there are so many geologists there, plus countries affluent enough to do detailed geologic mapping."
- Steven Dutch, Natural and Applied Sciences, University of Wisconsin – Green Bay
There is also evidence there are craters under Antarctic ice, but it's not the most hospitable environment to go looking.
REF: https://malagabay.wordpress.com/2013/06/05/tektites-4-primary-and-secondary-impact-craters/