|MadSci Network: Earth Sciences|
Gondwana originally consisted of Australia, Antartica, Africa and South America. About 160 million years ago it began to break up. First of all, Antartica and India broke off. Africa and Asia then separated and 70 million years ago Australia broke off from Antartica. Since then India has moved North into Asia and is continuing to do so. India is colliding with Asia and the result is the Himalayas.
I don't want to say too much more because you could write a whole book on this question. But if you need to know more try the link below.
here for more geological information about the earth's tectonic
Try the links in the MadSci Library for more information on Earth Sciences.