The Antarctica was part of warm and green Gondwana. How did it become cold and isolated?

650 million years ago, there was a giant super continent in the south. Now, we name it Gondwana. Antarctica formed the central part of that landmass. In those days, the climate was warmer and human beings had not appeared. Many species of flora and fauna were there. For 500 million years, Gondwana thrived. However, around the time when dinosaurs disappeared and mammals began to develop, Gondwana began to break up. India broke away and pushed herself against Asia and buckled its crust to create the Himalayas. South America drifted to join North America opening up the Drake Passage. This created a cold current that goes round the South Pole. On account of this, the Antarctica was left not only isolated but it became frigid and desolate also.

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