Multi-storied buildings fall down to the ground due to earthquakes and landslides. Similarly due to severe earthquakes before the end of the world all mountains may fall down exposing the land behind them. All human beings will be brought back to life, gathered together and presented before Allah (SWT) for the decision of their cases based on the record of deeds which will contain everything an individual did. This record of deeds may be our memory.

And We have made every man’s fate (or action) to cling to his neck {2}, and We will bring out for him on the day of resurrection, a book (or a record) which he will find wide open. (It will be said to him), “Read your book, this day your own self is sufficient against you as one who takes account.” 17:13-14