Gondwana was known as the great southern landmass that made up part of a much larger continent called Pangea. This was around 250 million years ago.
The massive continent Gonwana, was made up of what we call today, Africa, South America, India, Madagascar, Australia and New Zealand. The other part of this supercontinent was called Laurasia, which was made up of Europe, Asia and North America.
It is believed that the massive continent began to drift apart around 165 million years ago. This caused great tension in the earths crust, causing volcanic activity from the magma in the earth's mantle. This lead to solidified evidence of the magma from the Gondwana break up.
The Australian and Antarctic plate took a long time to separate, only 45 million years ago. This resulted in Tasmania and Antarctica having many geological similarities.
Continental Drift...
We believe that the coastlines of the continents appear to fit together (like a puzzle). This suggest's that they we once joined together in one big land mass, but have drifted apart over millions of years which is being proved by scientists as 'continental drift'.
Continental drift is when countries or land masses move around by movements in the deeper layers of rock in the inner mantle. Scientists believe all the continents were once joined together in a land mass called Pangea. It broke into two big land masses, called Gondwana and Laurasia. These two land masses then split into small groups, creating the 7 continents.