Here's a breakdown:

* Plate Tectonics: The Earth's surface is made up of large pieces of crust called tectonic plates. These plates are constantly moving, albeit very slowly.

* Continental Drift: Millions of years ago, the Indian subcontinent was a separate landmass drifting northward.

* Collision: The Indian plate eventually collided with the Eurasian plate.

* Uplift: The immense force of the collision caused the land to buckle, fold, and uplift, creating the Himalayan mountain range.

This process is still ongoing, which is why the Himalayas continue to rise today.