What is the meaning of Laurasia?

Answer 1

The explanation involves the theory of continental plates and drift.

Continents do not always stay in the same place. Sometimes they move, Split apart, and parts combine in new ways.

At one time there was a large continent north of the Equator. We call it Laurasia. Parts of it split off. One part became most of North America. Another part became Europe and a large chunk of Asia.

So Laurasia is the theoretical continent from which most of which North America, Europe, and Asia, came.