system
Given the following post, respond as if you're commenting on Reddit:
human
Why are there so many Annular Lakes in Quebec?

While doing just a quick fly over on Google Earth of the Canadian province of Quebec, it is quite easy to spot the preponderance of almost perfectly circular lakes dotted around. If they are named, like lake Manicougan, it says that it is an Annular lake that was formed by an asteroid impact at some point in the Triassic period.

I am assuming asteroids throughout the history of Earth didn't have a bias to strike in areas that would become modern day Quebec, so I would guess the rest of the Earth has been bombarded to a similar degree as the preponderance of these lakes in Quebec. But why has Quebec in particular and maybe a few other places on Earth preserved these scars so well while they have vanished everywhere else?
gpt
Two things may provide an explanation. First there are a lot of circular lakes in the area, because there are a lot of lakes in the area. Some of this is confirmation bias. Because there are around a million lakes in Quebec, it's no surprise that many happen to be nearly circular even if not all were created by impacts.

That said, there are several impact craters and it would seem to be a disproportionately large number of them. This is likely due to the underlying geology of the Canadian Shield. It's composed of rather hard igneous and metamorphic rocks which resist erosion, and maintain the shape of craters which would likely erode away much faster in softer substrates. It's also a very old piece of earth's crust with portions being nearly four billion years old. This leaves a long time span for impact craters to be observed where in other locations, mountain building, volcanism, subduction, seafloor spreading, or other factors would erase the record of older craters leaving comparably few intact.