Page 1 : Std: IV, Sub: Geography, 23. Natural Disasters, , Note: Students have to write the given exercise in their, geography notebook., Difficult words:, Settlements, Earthquake, Collapse, Occasional, , Downpour, Hailstorm, Frightened, Devastation, , Meaning:, Devastation - great destruction or damage., , Q.1 State whether the following statements are True or False., 1. An air crash is a natural calamity. - False, 2. Tsunami causes great damage to property. - True, 3. Hailstorm is favourable for mango production.- False, 4. During an earthquake, some houses collapse into heaps. -True, 5. Untimely rains cause serious damage to crops.- True

Page 2 : Q.2 Match the following., 'A', , 'B', , Tsunami, , Rise in, water level, of river, , Flood, , Gigantic sea, waves, , Answer:, 1. Tsunami- Gigantic sea waves, 2. Flood- Rise in water level of river, Q.3 Answer the following questions., 1. What kind of rain in winter is good for the crops?, Ans. Occasional light showers in winter are good for the crops., 2. What are ill-effects of hailstorm?, Ans. (1) Severe hails causes injuries to people and animals.(2) It, shatters roof tiles.(3) It can damage crops in the fields and fruits in, orchards.(4) If mango trees are in blossom at that time, the blossoms, may rot or fall down.This leads to a fall in mango production., 3. Should one go for a swim in flood waters?, Ans. One should never go for a swim in flood waters., 4. How does a tsunami affect vehicles on the coast?, Ans. Tsunami throws away vehicles on the coast along with people in, them to quiet distance and vehicles are crushed.

Page 3 : 5. What is the difference between a hailstorm and snowfall?, Ans. (1) Snowfall may not cause serious damage to crops. However,, hailstorm damages crops in the fields and fruits in orchards.(2), Snowfall may not injure people and animals. However,hailstorm, causes injuries to people and animals., 6. If there are animals with fur coats living in places where it, snows, would the coat be thick or thin? What could be the, reason for it?, Ans. (1) If there are animals with fur coats living in places where it, snow, they will have thick fur coats.(2) They will have thick fur coats, for protection from cold., Note: Students have to write the given exercise in their, geography textbook.( Pg. No.144 and 145), , Q.4 A table for natural disasters and man-made disasters is given, below. Complete the table with the help of the list that follows., No., , Natural disaster, , No., , Man-made disaster, , 1., , Cyclone, , 1., , Collapse of an old ramshackle, house, , 2., , Death due to lightning, , 2., , Collision of two railway trains, , 3., , Children on a playground, getting injured when a termite, ridden tree falls, , 3., , A fire caused by the explosion, of a cooking gas cylinder, , 4., , Normal life getting disturbed, due to heavy snowfall, , 4., , An air crash due to a, mechanical fault

Page 4 : 1., 2., 3., 4., 5., , Cyclone, Collapse of an old ramshackle house, Death due to lightning, Collision of two railway trains, Children on a playground getting injured when a termite ridden, tree falls, 6. Normal life getting disturbed due to heavy snowfall, 7. A fire caused by the explosion of a cooking gas cylinder, 8. An air crash due to a mechanical fault, , Q.5 Fill in the blanks., 1. Waves just like the ones we see in water, are produced in the, bowels of the earth., 2. If it does not stop raining, the rainwater enters the settlements., 3. People and animals are helpless against the force of a tsunami., 4. People get trapped under the heaps and die.