We can see the process of land changes today, and we have been able to observe them for thousands of years. Islands rise and fall, lands that once existed are covered by sea, others are exposed. Lakes evaporate or are sucked up overnight. Tropical areas become desert and vice versa. Icebergs break from polar regions. Earthquakes and volcanoes produce obvious and dramatic changes in land. Even the recent tsunami in Asia was felt all over the globe literally (it shook the planet and I believe moved it a fraction). All of this is demonstrable and has been witnessed and measured repeatedly. Unlike evolution. There is no comparison.
Yes. Just like the process of evolution where we see species alive today that were not in existence millions of years ago. And we witness changes in animals from generation to generation.
But, just like no one has ever seen a microbe evolve into a giraffe, no one has ever seen a new continent form. It is theory.