(Al-Kahf) 18 : 47
وَيَوْمَ نُسَيِّرُ الْجِبَالَ وَتَرَى الْأَرْضَ بَارِزَةً وَحَشَرْنَاهُمْ فَلَمْ نُغَادِرْ مِنْهُمْ أَحَدًا
And on the Day when We will move the mountains and you will see the earth prominent, and We will summon them and none will be hidden from Us.
Three-Time-Knower Lord has already decided whatever happens in this universe and has inscribed in his Glorious Reading Adhikr as told in verses 85: 21-22. Doomsday will happen when all mankind become transgressors like the Arabic Quran reading Fujjar who hide and reject Adhikr. On the Day of Judgment Earth will be changed to another form as explained in verse 14: 48. And Lord will move the mountains like the clouds as explained in verse 18: 8.