Translation of the verse 47 from Surah Al-Kahf : Number of verses 110 - - page 299 - Part 15.
And (remember) the Day We shall cause the mountains to pass away (like clouds of dust), and you will see the earth as a levelled plain, and we shall gather them all together so as to leave not one of them behind.
And [warn of] the Day when We will remove the mountains and you will see the earth prominent, and We will gather them and not leave behind from them anyone.
(18:47) The only thing, for which you should prepare, is the Day when We will set the mountains in motion, *42 and when you will find the Earth quite naked, *43 and We will muster together all human beings in a way as to leave none at all behind, *44
*42) The mountains will begin to move about like clouds when the gravitation of the earth shall be brought to an end. The Qur'an has described the same thing in XXVII: 88 in this way: "When you see the mountains, you consider them to be firmly fixed, but they shall be floating about like clouds at that time."
*43) "You will find the Earth quite naked": You will find no vegetation and no building on it and it will become a barren plain. It is the same thing that has been stated in v. 8 of this Chapter.
*44) That is, "We will muster together every human being from the first Man, Adam, to the last one born in the last moment of the Day of Resurrection: even that child which had breathed the first breath after its birth, shall be resurrected and all shall be mustered at one and the same tune."