And suddenly they will be [alert] upon the earth's surface. (79:14)

Almuntakhab Fi Tafsir Alquran Alkarim

and there they declare themselves on the surface of the earth

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(79:14) and lo, they will all be in the open plain. *5

And suddenly they will be [alert] upon the earth's surface. meaning

*5) That is, "They are mocking it as an impossibility, whereas it is not at all a difficult task for Allah for the performance of which He may have to make lengthy preparations. For it only a single shout or cry is enough at which your dust of ash will gather together from wherever it lay, and you will suddenly find yourself alive on the back of the earth. Thinking this return to be a return to loss, you may try to escape from it however hard you may, but it will inevitably take place; it cannot be averted by your denial, escape or mockery."
 

And suddenly they will be [alert] upon the earth's surface. meaning in Urdu

اور یکایک یہ کھلے میدان میں موجود ہوں گے