A mountain is formed by tectonic plate and it push together and it forms a big mountain. The mountain are not formed quickly it takes millions of years to form because the tectonic plates move slowly it takes a lot longer to form. However mountains are not formed all the same there are different types of mountains which are , fold , block , dome and volcanic. Because of the weather there are constantly eroded [to erode something is to wear it] mountains are jagged.
Either side has two slabs that don’t move because the middle one gets pushed and the over two don’t get pushed up. where the lines brake apart these are called fault. Earth quacks happen across the faults.
A brilliant information page on mountains and how they are formed. Great use of subheadings and pictures.