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From SPACE.com:
When a meteorite struck Earth before humans were around to watch, did it still make a "splat?" Although it's too late to witness the many pummelings our planet has already seen, scientists are still finding the humongous holes left here by long ago impacting space rocks.
At last count, there were more than 170 known impact craters on our planet, according to the Earth Impact Database maintained by the University of New Brunswick in Canada. These puncture wounds are littered over every continent, as well as the seafloor.
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Re: Holes in the Earth: 170 and Counting
