EURASIA
Continental drift
There are "7 continents" due to a combination of how plate tectonics processes have fractured the light granitic rocks that make up the continents and then smashed them back together over time, along with human perceptions (e.g. Europe and Asia are considered by human perception to be separate continents but they are a single continent of Eurasia in terms of plate tectonics processes). At various times in the past there have been as few as one continent and at other times there have been more than the current number.
If the movement of the plates brought all the continents together again, a single continent would form. At the moment plate movements are not heading in that direction.
The largest single landmass on Earth is Afroeurasia (the continents of Africa, Europe, and Asia). It occupies 85,000,000 km2, or about 5 times the size of Russia.
Pangea
Pangaea.
Alstralea has four continents.
The continents merged into a single supercontinent known as Pangaea during the Paleozoic and Mesozoic eras, specifically in the late Paleozoic era around 300 million years ago. This supercontinent began to break apart during the Mesozoic era, leading to the formation of the current continents.
Pangea
The single continent that split into two continents called Gondwana and Laurasia is Pangaea. Pangaea was a supercontinent that existed about 335-175 million years ago, before eventually breaking apart into these two landmasses which later drifted to form the continents we know today.
they drifted together to form a single continent
Asia is a continent. Continents do not have capital cities only countries have these. The possible exception being Australia as this is considered a continent and a single country.
Continental drift
If put together, they would fit perfectly into one huge super continent like a puzzle.
They are continents. Unless, because they are joined, you consider them part of a single continent, i.e. America.
Jurassic
That is what's believed, yes. The super-continent is called Pangaea/Pangea.