what makes a continent? why is europe and asia not one big continent?  The Ural mtns is the dividing line, why there?

The scientific answer is that, according to Plate Tectonics, Europe and Asia are separate plates, which just happen to be joined together at the Ural mountains at present. (The Ural mountains were raised when the two plates collided with each other.) And India was once part of southeastern Africa and Antarctica, but broke off from these and sailed north to smash into Asia, which raised the Himalaya mountains. Also, did you know that the American Appalachian mountains, the Scottish highlands, and the mountains of eastern Norway, were all once upon a time joined into one single mountain range? Very cool, huh?

Cheers

Because Europe is mostly white and Christian, unlike Asia.