Tafsir of Al-Qari`ah 101:5

And the mountains will be like wool, carded. meaning, they will become like carded wool that has began to wear out (fade away) and be torn apart. Mujahid, Ikrimah, Sa`id bin Jubayr, Al-Hasan, Qatadah, Ata' Al-Khurasani, Ad-Dahhak and As-Suddi have all said,

كالعهن

(like wool (`Ihn). "Woolen.'' Then Allah informs about the results received by those who performed the deeds, and the honor and disgrace they will experience based upon their deeds. He says,

فٲما من ثقلت موازينه