To all of you who didn't pay attention to geology classes in school ...
Meteor / Barringer Crater in Arizona, USA ... from a hard meteorite impact.
and
Uluru / Ayers Rock in Northern Territory, Australia ... how it was formed.
Above should prove to any flat-earthers that our Earth is round.
By the way, the Australian government sensibly banned climbing Uluru.
Otherwise you'll fall into outer space.
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https://mntviews.blogspot.com/