Ablank measures and records earthquakes

Seismographs.  Seismogram is what the lines are called made by the seismograph.  It responds to the increase or decrease in the vibrations.  

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.