The mountains put in motion turning into a mirage.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (and the hills are set in motion) on the face of the earth (and become as a mirage.
Jalāl al-Dīn al-Maḥallī
تفسير : and the mountains are set in motion, dislocated from their positions, and become as a mirage, as fine dust, that is to say, like it in terms of its levity when in motion.