Pangaea
Continental drift
If by land mass you mean the surface, then 99% is habitable.
The theory that the continents used to be one single land mass all "pushed together" is called pangaea
pangea
Different to what the world looks like now. Probably becoming one big land mass because of the way the techtonic plates are moving. The land mass may have some seas unlike pangia.
Continental drift
Jurassic
A large land mass is commonly called a continent.
Asia
If by land mass you mean the surface, then 99% is habitable.
Europe and Asia are the two continents that are located on a single land mass. This means that there isn't a large body of water separating the 2 continents.
The north and eastern hemispheres
north
it WA called Pangaea discovered or believed in by Alfred wegener
north
north
The combined land masses of Asia and Europe is called Eurasia.