Final answer:
The Himalayan mountain range began forming when India collided with the Eurasian plate 10 million years ago.
Step-by-step explanation:
The crustal feature that began forming 10 million years ago when India collided with the Eurasian plate is the Himalayan mountain range. This collision caused the uplift of the Earth's crust, resulting in the formation of the Himalayas. The Indian plate, moving northwards, continues to push against the Eurasian plate, causing ongoing tectonic activity in the region.
Learn more about Plate tectonics