A peak is a jagged mountain top.
The sharp jagged mountain top is called the peak. The very top of the mountain might also be referred to as the summit.
young
A young mountain has steep sides. It also has sharp jagged peaks and narrow valleys. Older mountains are more rounded.
by my sharp turds
young mountains are jagged on top, older mountains are smoother
One way to tell the age of a mountain range is by its height. Another way is by how eroded and worn the edges of the rocks are. The more jagged the edges, the younger the mountains. Heavily worn ranges may be so eroded that they become foothills
Sharp, rough, or eneven
Here is an example sentence with the word "jagged":This mountain was hard to climb as its surface was very jagged.
A jag is a sharp projection or a fragment of something which has been broken off.
Wherever there is one. An arete is a sharp edged ridge, but it is not necessarily right at the top of the mountain.
Having rough, sharp points protruding.