Earthquake

                                                                                                               WHAT IS EARTHQUAKE? An  earthquake  (also known as a  quake ,  tremor  or  temblor ) is the shaking of the surface of the Earth, resulting from the sudden release of energy in the  Earth 's  lithosphere  that creates  seismic waves . Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to toss people around and destroy whole cities. The  seismicity , or  seismic activity,  of an area is the frequency, type and size of earthquakes experienced over a period of time. The word  ...