Just one. Australia is both a country and a continent.
Australias history can only be dated back to 1606 as the first recorded European landed on the continent naming it New Holland. Before this date, Australia did not exist. The Aborigines never recorded history so they being in the continent really accounted to nothing. They did not build anything, they did not farm, or create any scientific technologies. The Aborigines were nomadic meaning they did not own the land they merely lived off it. The Aborigines didn't even have a name for the continent. So since it is 2011, Australias history dates back 405 years.
there are heaps
Antarctica is its own continent.
The Inuit do not have their own continent.
Australia is its own continent.
No continent 'has' Europe. Europe is a continent in its own right.
Australia is its own continent and island.
Mainly coal.
Antarctica is its own continent.
Yes, Asia is a continent.
It is its own continent.