Take a step back and look closely. Notice "mountains" from all around the World that are simply petrified tree trunks. The "mountain ranges" around them are simply the root system of the tree.
The same kind of root system the changes the level of the ground in our yards.
Now that you are aware of this, look at mountains (and sometimes hills) are the trunk and root system of different types of trees.
Once I learned of this all I did was search, "mountains" and "mountain ranges" in google images and pull the most obvious photos that are giant ancient trees.