Mountains - an imported item
Even these mountains are imaged:

Contents
1) Mountains - Anchors were inserted in the Earth;
2) Mountains are not statically fixed, they move.
3) Purpose of insertion of anchors in the Earth;
4) Mountains have streaks/stripes of various hues;
5) Ranges of mountains cannot be crossed over walking longitudinally;
6) Mountains will be crumbled to dust particles on the Last Day.
We are studying about Man and the Universe - Why is the Universe the way it is. The Mountains are an important element of our Universe. Now we will study the information mentioned about mountains in the Grand Qur?ān. The most striking information is that the word "creation" is not used for the mountains with reference to the creation of our Universe. Instead verb denoting "inserting, rendering" is used:
http://haqeeqat.pk/Mountains.htm