I used to do my act on cruise ships that went up the Inside Passage to Glacier Bay in Alaska. You begin sailing up this large, calm river with whales and porposies through beautiful country with tall trees. After a few hours your realize that the trees are getting smaller and smaller. After a few more hours there are no more trees, only soft, rolling hills with scrubby plants. A cople of more hours later and the few scrubby plants are gone and there's nothing but smooth naked rock. Then you hit the Glacier at the end of the river.
What I learned was that this Glacier had recceed about 25 miles in the last 50 years or so, and as it receeded life returned to the land. Which is why there were trees far from the Glacier, and less and less life as you got closer to the Glacier, because the land near the Glacier was only recently under ice.
Fascinating. And a little scary, to think that in a lifetime the terrain of the earth could change so dramtatically.
While parked in Glacier Bay I was on stage doing a sound check for my show that night. I was on a body mike doing my "Check One Two Three" routine when I happened to look out the theatre window at the Glacier and saw it calve an iceberg. It was astonishing, and, with a group of passengers sitting around reading newspapers, I said, "Check One Two Holy shit would you look that!"