Where, I'm unsure, but when, I think I know. There is a theory that the first asteroid to hit Earth was actually a comet. It wiped out the dinosaurs.
Answer: Asia
I’m assuming you wanted the continent
Explanation:
Advantage-extra work\data to compare first data with.
Disadvantage-Your data might change over time.
True, because the greatest populated areas would not be in the mountain rages.
It's called Coastal flood