Amountain showed the following change in profile over millions of years. what happened to most of the material removed from the mountain?

Rocks at the surface of the Earth are of many different ages, ranging from over 3 billion years old to less than 1 million years old.  Because under ordinary circumstance matter can neither be created or destroyed, the new, younger rocks must have originated from the older crustal material -  older rocks. Older rocks are destroyed by weathering processes and the remains are recycled into new rocks.  This cycle from old rocks to new rocks is called the rock cycle.

Dthrough a slow process