The Himalayas are young fold mountains, which are still rising under the influence of the earth's tectonic forces. This continuous vertical growth and the tectonic activity in the region result in certain characteristic features.

Deep gorges are formed due to the erosional activity of rivers flowing through these mountains. The Kali Gandaki Gorge in the Himalayas is one of the deepest in the world.

The rivers in the Himalayas often take sharp turns or U-turns due to the rugged and uneven topography.

The Himalayas consist of a series of parallel mountain ranges such as the Greater Himalayas, Lesser Himalayas, and the Outer Himalayas.

The steep slopes of the Himalayas, combined with the unstable nature of the young rocks, often result in landslides.

Therefore, all of the given features can be said to be evidence for the Himalayas being young fold mountains.