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CH 4 - Air : Questions and Answers, (27, Lage:, 1. Aus wes the fotlo wing questions-, Our earth that is orounded by a huge blanket of air is called, atmosphere. It is a mass of äir thatt' has made the temperature en, the earth liveable. It is also necessary for our survival on the, earth becaue it provides us air that we breath and protect us, from the harmful effects of the Aun's rays., Ans 1, The two gares that make the bulk of the-atmosjphere are, nitrogen C 78%.) and, Corbon dioxide gas creates greenhoue effect in the, Ans 2, oxy gen (21%):, Ans 3, atmosphere., Weather is a short time periods of a, hour-to -hour or, dramatically from 'day to day in a place., place A weather is a, can change, Ans.4, day, clay condition that, to, Aus 5J There are three types of rainfall, fllowing, as, O Cyclonic vainfal, O Relief or, O Convectional rainfall, Orographic raintall, Ana 6. An air pressure is a pressure that is exerted by the weight, of air on the earth 's 'surgace.

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C Page no: 27), ☺ d. Troposhepere, O b. Decreases, 2., Tick the correct answer., C., Ozone, b. Stratosphere, b. Rain, Match the following:, O Trade winds, @ Loo, O Mousoon, wind, 3., © Permanent wind, O Local wind, → 6 seasonal wind, O Horizantal movement of Afr, 4., Give reasons., O As the air gets warmer its capacity to hold moisture, increases., therefore, it becomes more and more' humid, on such days water, clothes or swe at from our hody does not evaporate et easily., That is why , wet clothes take, 'a longer time' to dry., ., ☺ from the equator, it goes on coming through slanting rays., Slanting rayš come on the earth passing longer distarices through, the atthosphere. They heat up more, less heat on a paint of space. That's why the amount, fusolation decreases from equatur towards poles:, space., Hense, thee is