Earthquake causes a great disaster. It's a sudden movement of a part of the earth's surface caused by deep crack in the earth or by volcanic eruption. Some regions of the earth are prone to earthquake while others are comparatively safe from this natural disaster. Some countries like Japan, Iran etc. are frequently hit by earthquake. Houses & bridges in these countries are built shock-proof. Forecast regarding the occurrence of earthquake is not possible. A severe earthquake causes widespread destruction of houses & properties. People are crushed under the broken houses. Often several quakes hit a place at short intervals. So after a quake people live in tents on open field. When a server quake hits a populous city thousands of people are killed & injured. Many people get trapped in the broken houses & it takes day to rescue them. The only way to get rid of the ravages of this natural disaster is to build houses, bridges & roads in such a way that they can
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