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 resist the tremors.
Physical exercise means the regular movement of the limbs of our body according to rules. It is essential to keep our body fit & mind sound. There lies a close connection between body & mind. We can not think of a sound mind without a sound health. It is physical exercise which enables us to build a good health. Physical exercise makes our body active & the muscles strong. It also improve our power of digestion and blood circulation. It gives strength to our brain. A machine gets rust for want of proper use. Human body is also a machine. It becomes inactive & weak for want of exercise. So we should take regular physical exercise in order to maintain a sound health and lead a happy life.
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