Give geographical reasons(a) Buildings collapsed at the foothillsof the Himalayas because ofan earthquake. Before collapsingthey were moving forward andbackward.

Give geographical reasons(a) Buildings collapsed at the foothillsof th

1.	Give geographical reasons(a) Buildings collapsed at the foothillsof the Himalayas because ofan earthquake. Before collapsingthey were moving forward andbackward.
Answer» Because of the movements occurring in the interior of the earth, tremendous tension is created in the earth’s crust. When the tension goes beyond limits, the energy is released in the form of waves. This results in trembling of the earth’s surface, i.e. earthquake occurs. The seismic waves can be divided into primary, secondary and surface waves. It is because of the primary waves that the buildings on the earth’s surface move back and forth.