Day of Judgment (Qiyamah)

وَإِذَا ٱلْبِحَارُ سُجِّرَتْ

And when the seas are filled with flame

وَمَآ أَدْرَىٰكَ مَا ٱلْقَارِعَةُ

And what can make you know what is the Striking Calamity?