State two facts in support of the gradual rising of the Himalayas.

The Himalayas have been raised by different mountain building movements in different geological periods. These movements took place in a gradual manner in three stages.

1. In the first stage, the uplift of the central Himalayan axis took place in Oligocene period about 150 million years ago.

2. The second uplift took place during the Miocene period when Potwar region of West Pakistan was uplifted.
3. The third stage was marked by the folding of the Siwalik in the post-Pliocene period about 100 million years ago.

Some geologists believe that Himalayas are still rising. It proves the gradual rising of the Himalayas.