earth quakes and volcanoes make mountains-for instance Yellowstone-raised up like 12"? last year alone-I think-anyhow the ground around there is rising-underneath sits one the most volatile threats to human kind.
YES I JUST SAW THATLOL
IT was the plates in the earth coming together not the ocean. The Poconos on the east coast of the U.S. are the oldest that is why they aren't as tall because over time they are finished rising and now they are spreading out. The tallest mountains are newer and like myephaunts says they are still getting bigger.