The Surprising History

A long time ago, some 170 million years ago to be precise, Antarctica was a part of a bigger supercontinent called Gondwana and some 25 million years ago it broke down into an emerging continent away from the supercontinent. It was situated farther north and faced tropical climates with heavy vegetation and life. Then, what made it shift to the polar region, making it all ice? Did the earth revolve at an instant or at 360 degrees with tremors that made the piece of land nothing but ice?