Europe and Asia are on the same landmass because they're connected by land. A better question would be "why are Europe and Asia separate continents if they're on the same landmass" in which the answer would be that the Europeans wanted a separate continent because of the historical, physical, and cultural differences.
Asia and Europe both share the same land mass.
North and South America are not located on the same land mass as Asia and Europe are. However, North and South America are located on the same land mass as each other, just as Europe and Asia are.
Europe, Asia, and Africa are all on the same continental land mass, but they are split apart politically.
Europe and Asia
Asia shares the European land mass with Asia beginnning east of the Ural Mountains in Russia.
Europe and Asia as well as North and South America.
Europe and Asia
Europe and Asia share the same land mass.
Yes, Europe is a continent, located just west of Asia on the same land mass.
Asia and Europe and north and south America
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Yes. The boundary between Europe and Asia is the Ural mountain range in Russia.