What is the main cause of an earthquake?

force of gravity
the shaking of the ground
stress caused by plate movement
waves that ripple from the epicenter

The answer is “Stress caused by a place movement”

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The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.