(At-twur) 52 : 6
وَالْبَحْرِ الْمَسْجُورِ
And the sea kindled with fire.
It is told in verse 81: 6 that as a part of Dooms day the sea will be set ablaze.
The structure of water is a molecule contains two hydrogen atoms and one oxygen atom. Due to the severe vibration and thereby the severe blasting of Dooms Day, the elements of water, Hydrogen and oxygen will be separated, and Hydrogen which is a combustible element will be blazed with the help of oxygen which helps to ignite.