Final answer:
The Himalayas formed 10 million years ago due to the collision of the Indian plate with the Eurasian plate, an ongoing process that continues to elevate the mountain range.
Step-by-step explanation:
The crustal feature that began forming 10 million years ago when India collided with the Eurasian plate is the Himalayas. This mountain range is a result of tectonic plate movements and is part of the larger process that started about 70 million years ago.
The ongoing collision causes the Himalayan mountains to rise by about one to five millimeters per year. This is an example of a continent-continent convergent boundary, where two tectonic plates are moving towards each other leading to the compression of the crust and the consequent formation of mountain ranges.