What are the names of the sub-continents of the world?

The answer really depends on the definition of sub-continent, but the most common answers are:

The Indian sub-Continent which is crashing into Asia building the Himalayas and still growing at the rate of 3-5 cm a year.

The islands of New Zealand considered part of Australia, but really on a different plate.

Madagascar considered to be part of Africa, but on a different plate.

and Greenland which is generally considered part of North America.

Some may consider the Arabian Peninsula to be a sub-continent as the African and Asian plates tear apart.