Surah 101. Al-Qariah, Ayah 5

Cf. n. 5682 to lxx 9. The mountains are solid things, which seem as if nothing could move them. But in that tremendous cataclysm they will be scattered about like flakes of leased or carded wool. This is a metaphor to show that what we consider very substantial in this life will be as an airy nothing in the next world.