And of His signs is that the heaven and earth remain with His Command; then when He calls you with a call from the earth, immediately you will come forth.
The Command mentioned in 34 places such as in verses 2: 109; 7: 54; 22: 65 and 32: 24 is Adhikr. Adhikr is the Balance and Trust to keep the universe in its equilibrium. By the departure of the last forerunner from this world, 10 Crucial Signs of Doomsday as explained in verse 6: 158 will appear one by one.
It is told in verse 50: 44: “On the Day the earth breaks away from them rapidly; that is a gathering easy for Us”. “When He calls you with a call from the earth, immediately you will come forth” mentioned in verse means, the resurrection and Day of Judgment will be happening on earth itself. See explanation 16: 1-2 and 27: 87-88.