Earth's crust has been slowly moving for billions of years. Not only mountains are slowly moving but also whole continents.
How Do We Know The Continents Are Moving?50 years ago, "continental drift" was a fringe hypothesis rejected by most geologists. Today the theory of plate tectonics (which includes continental drift) is universally accepted as true, and unifies once-separate areas of geology under one grand banner. There are mountains of evidence (literally) that plate tectonics has taken place in our planet's past.
Whole contionents are moving. This was known recently. But 1400 years ago the Quran said that mountains move:
٨٨ وَتَرَى الْجِبَالَ تَحْسَبُهَا جَامِدَةً وَهِيَ تَمُرُّ مَرَّ السَّحَابِ ۚ صُنْعَ اللَّهِ الَّذِي أَتْقَنَ كُلَّ شَيْءٍ ۚ إِنَّهُ خَبِيرٌ بِمَا تَفْعَلُونَ
Mountains move away just like clouds move away.
How could an illiterate man who lived 1400 years ago have known that mountains move?
The Quran (Koran, the book of Islam) contains scientific knowledge that could not have been known 1400 years ago. It ranges from basic arithmetics to the most advanced topics in astrophysics. You are invited to go through those miracles and judge for yourself.