You first have to ask, “what makes mountains”.
Mountain ranges are not permanent, they build up when two tectonic plates collide.
The Himalayan Mountains were caused by India moving north and colliding with Asia. This means that there used to be an ocean between them and at the bottom of that ocean were sediments containing fossils. As they collided, the sediments between them were slowly squeezed, folded and pushed up onto the land as a mountain range, including their fossils. The mountains are still growing and at the same time being eroded. Other mountain ranges have similar stories to tell with some variation.

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