er band pulls the brick behind it, and this is how the energy builds up and then it is released quickly.
             Then he had a Seismograph, a device that measures seismic waves on a table and he was explaining how to read the intensity of the vibrations. He had first one kid jumping in front of he seismograph, then two, then three, then four and so one and one could see the intensity of the vibrations being recorded by the seismograph. He also talked about the use of seismic stations all over to monitors earthquakes and artificial vibrations like explosions, etc. The Seismology department at LDEO monitors seismic activity in
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