[UnbelievingScumOnTheOtherSide]

This 3/4-mile wide crater was made by a 50-meter (160-foot) nickel-iron meteorite 50,000 years ago.
It would have flattened every tree or structure 20 miles around it.
A rocky or cometary meteorite would have to be twice or three times as wide to survive to the ground.
Worst case is if it explodes just before hitting the ground which would double the area of devastation. (like Tunguska)
A 1-km meteorite would wreck a continent, or at sea make a tidal wave larger than seen anywhere by modern man on every adjacent shore.

Meteor Crater, Arizona

[Tellurian]

A 1-km meteorite would wreck a continent

Smaller than I supposed! I wonder if anyone has a table of how frequently various size meteorites are annihilated by the earth.