View Tom Dempsey's images of Antarctica: ice berg with arch, Chinstrap penguin on Aitcho Island, Gentoo penguin colony on Cuverville Island, cruise ship M/S Explorer beneath mountains of the Antarctic Peninsula, Crabeater seals (Lobodon carcinophaga) rest on ice floe, eco-tourists in a Zodiac boat, people, and penguins at Neko Harbor on the continent of Antarctica. A world globe illustrates the Pangaea supercontinent 250 million years ago and Australia separating fom Antarctica 40 million years ago.