So, I guess I'm just curious, lol, because I've read a bunch of things on this site and have gotten confused. Some of the stuff contradicts the other stuff. How do we know its 150' tall, or is that like an average? Why does the ice shelf/wall only form around the rim? I'm guessing by the silence that there's no pictures. I tried googling it, but I only got game of thrones images or obviously glaciers. thnx for responding.