Surah Taha 20:105

وَيَسْـَٔلُونَكَ عَنِ ٱلْجِبَالِ فَقُلْ يَنسِفُهَا رَبِّى نَسْفًا

And they ask you about the mountains, so say, "My Lord will blow them away with a blast.

Translation: Saheeh International

Tafsir

They will question you concerning the mountains how will they be on the Day of Resurrection? Say to them ‘My Lord will scatter them as ashes by pulverising them into moving sand and dispersing them with the wind;

Excerpt from Tafsir al-Jalalayn, commentary on 20:105, via Quran.com. The reader has the full commentary and 9 more tafsirs.