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 Front Back how does the wind vane tell us about the direction of wind flow? the weather vane consists of a pointed with a large rear end . moving air exerts pressure on the arrows and the pointed arrow shows direction of wind flow . it helps us to identify from which direction the wind is coming and to which direction it is going . it is fixed over a building and has north , south , east and west directions explain how is wind created wind is caused due to the heat of the sun . when a place gets heated by the sun the air above it also becomes hot .the hot air being lighter than the surrounding cold air. it moves up . to fill in this space ,cooler and denser air flows from the neighbouring areas .this causes the wind to flow what happens when the person blows the air between the balloons the low pressure is created between the two balloons . the high pressure outside the balloon is more making the balloons to come closer to each other why are high speed winds always accompanied with reduced air pressure explain giving reason a ir exerts pressure on all the things . when high speed winds are blown they blow off the air from that area thus creating a low pressure in that area . a low pressure is caused when there is lesser amount of air molecules and high pressure is created when there are more amount of air molecules in that area.this can be proved with the balloon demonstration why are roof blown of during storms .draw a diagram and explain it whe the high speed  winds are  blown during storms it blows the wind thus creating low pressure on the roof and under the roof the air exerts high pressure . this imbalance in pressure causes the roof to fly pressure difference between two points causes wind to flow .is this statement correct?give reason to support your answer the more the difference between the two points the faster is the wind flow .as the pressure increases the velocity also increases explain with a diagram the reason for wind circulation on the earth's surface the wind always move from high pressure to the low pressure region . the temperature near the equator is high than near the poles . this is due to the direct sunlight received by the area near the equator.high temperature means low pressure area and low temperature means high pressure area what is tornado?how is it different from a cyclone? tornado is the most violent small scale storms on earth it is mostly formed on the land . it proceeds in a rotating column and extend from the surface to the thunder cloud.it is not as destructive as cyclone wheras cyclone causes lot of damages across the world . it is because it happens in the seawhich generate high waves and washes away everything which comes on its way by accompanied by rain which causes flood and damage people's belonging and farm land 1.    which states of India should  take preventive measure and why? Indian has coastline on its east and west side. the states lying on theses coastlines are vulnerable to cyclones and cyclones.it has been observed that the  east coast of india are more vulnerable to cyclones than the western coast . high intensity  cyclone frequently it the eastern coast of India 1.    list some personal safety measure during thunderstorm 1.     always stay inside your houses during storms,do not go outside for fun 2.     secure windows and doors and stay away from them 3.     donot touch electric switches  and  broken wires 4.     store enough food for emergency 5.     cooperate and help your neighbour 6.     keep battery operated  torch or candles and matchstick with you 1.    why does the fertility of soil reduce in a cyclone affected area? The flood water contain alkaline in it.when it enters the farmland it affects the fertility of the soil. 1.    the advancement of scientific technology help us to take action against storms and cyclones. Comment on this sentence. It is true because now a dys satellites and radar keep track of the information and movement of cyclones and thunderstorm.  warnings are issued well in advance so that people can take preventive measures. 1.    list three disastrous consequences a cyclone can have? Cyclone kill hundreds of people living in coastal areas.it affect the fertility of the soil because the flood water contain alkaline  that enters the farmland The transport system is also badly affected as flood water covers the railway tracks and roads List some safety measure taken by the government during cyclone?   Warning system should be developed to forecast thunderstorm and cyclones Information about the storm should be conveyed to people  at the earliest Fishermen should not go to the sea People living in low lying areas  and coastline should be shifted to safer places Food storage should be made waterproof Enough drinking water should be stored safe for future use 1.    what is IMD? It means Indian meteorological department. It provides current and forecast information for weather sensitive activities like agriculture , irrigation , shipping etc.it also warn against natural disaster like cyclones.heavy rain,  snow etc 1.    explain with examples how wind exerts pressure on various things? If we keep a heavy object on our palm we feel it is giving pressure on our palm.if we can swim we know that the pressure of water on our body increases as we go deeper.similarly air surrounding on the earth’s surface exert pressure on it. 1.    describe with some activities that high speed  winds are always accompanied by reduced air pressure? Hang two blown up balloons on a stick at a distance of about 10 cm from each other . now forcefully blow out air from your mouth between the two balloons.you will notice that the balloons will appear to meet each other .the air blown at fast speed between the balloons reduces the air pressure between them.thus the pressure exerted on either side of the balloons becomes more and it pushes the balloons towards each other 1.    what are the problem faced by the the people living in cyclone prone areas? The vegetation is effected by the cyclone because of the alkaline flood waters.the transport system is also badly affected.it causes enormous damages to the people’s belongings and farmlands. 1.    how does wind vane tell us about the direction of wind flow ? the weather vane consists of a pointed arrow with a large rear . moving air exerts pressure on the arrows and the pointed arrow shows direction of wind flow. It helps us to identify from which direction the wind is coming and which direction it is going . the wind vane fixed over a building also have north , south , east  and west direction markers. 1.    explain how is wind created? Wind is caused due to the heat of  sun . when a place is heated by the sun the air becomes hot. Hot air being lighter than the surrounding cold air moves up . to fill this space cooler air flows from the neighbouring areas thus causing flow of wind 1.    why are high speed winds always accompanied with reduced air pressure explain give reason ? air exert pressure on all the things. when high speed winds are blown they blow off the air from that area thus creating a low pressure in that area . a low pressure is caused when there is lesser amount of air molecules and high pressure is created when there  are more amount of air molecule .this can be proved with balloon demonstration. 1.    why are roof blown of during storms . draw diagram and explain it ? under the roof air exerts pressure and on top of the roof  there is low pressure because of  the high speed wind which carries away some amount of air with it . the imbalance in pressure causes the roof to fly . 1.     pressure difference between two points causes wind to flow . is this statement correct ? give reason to support your answer. It is correct  because the more the difference between the two points the faster is the wind flow . as the pressure increases the velocity also increases. 1.    explain with a diagram the reason for wind circulation on the earth’s surface ? the wind always move from high pressure region to the low pressure region . the temperature near the equator is high than temperature near the poles . this is due to the direct sunlight received by the area near the equator high temperature-low pressure area                         low temperature-high pressure area State true or false air cannot exert pressure on rigid bodies f the device used to measure the direction of the wind is called wind vane the device used to measure the air pressure is called barometer the device used to measure the air pressure is called barometer cold air regions is called high pressur rgions warm air regions is called low air regions 1.     the regions around the equator are called ---- zone hig temperature 1.     the region around the poles are called -- zone low temperature 1.     the wind that flows from sea towards land and brings rain is called monsoon wind 1.    cyclones in USA are called hurricanes 1.     cyclones in china is called typhoons 1.    cyclones in Japan is called typhoon 1.     cyclones in Philippines is called typhoon 1.     cyclones in India is called tropical cyclones 1.     IMD stands for India meteorological department 1.     There is ---- during a thunder storm thunder and lightning 1.     The ----during storm can lift roof high speed winds 1.     The -- motion of --causes circulation or spinning of a cyclone rotational  , earth 1.   ---is used to measure the speed of wind Anemometer 1.     High speed wind is always accompanied by ---air pressure reduced ---- are responsible for causing lifting of roofs High speed winds 1.     When air expands and moves up it creates a region of -- low pressure 1.     When air contracts and moves down it creates --- zone high pressure 1.     The air moves from --region to -- region high pressure   ,  low pressure 1.     The air moves from --region to -- region high pressure   ,  low pressure 1.     The air moves from --region to -- region high pressure   ,  low pressure 1.     The air moves from --region to -- region high pressure   ,  low pressure 1.     The air moves from --region to -- region high pressure   ,  low pressure 1.     The air moves from --region to -- region high pressure   ,  low pressure 1.    The pressure difference on the earth is caused by ---- temperature difference 1.     When hot air moves up it is taken over by the air from --- cooler regions 1.     --- and ---cause severe destruction thunderstorm  , cyclone 1.     A small cyclone that often occurs in the USA is the --- tornado 1.     The state which is mostly affected by cyclones is -- Orissa 1.    On heating air the particle size increases 1.    Wind that flow from sea to land during day time is seabreeze 1.     A thunderstorm that moves on the land is called tornado 1.     A government department that makes weather forecast is --- meteorological department 1.     A technical  device used for tracking movement of cyclone is called radar what is wind?give its two characteristics. wind is the motion of air along the surface of the earth.the two characteristics are The earth gets heated up and the air surrounding it also gets warm and starts rising. the warm air is replaced by cold air and is called the wind flow.  Moving air exerts pressure on everything that comes along its way and tries to push them along the direction of its movement : how do a low pressure area develop on the earth's surface earth is round and the equator divides the earth into north and south hemisphere.the places near the equator receive direct sunfall so the air surrounding those places are warmer.the warm air is lighter and go up thus causing low pressure area in those regions what is a thunderstorm?how is it different from normal wind a thunderstorm is the violent weather condition of heavy rainfall,lightining and high speed winds.it is different from normal wind because wind is just the movement of air in the atmosphere and does not cause destruction what safety measures should we take to prevent the effects of cyclone? 1.       Always stay inside your house during storm 2.       Secure windows and doors and stay away from them 3.       Do not touch electric switches and broken electric wires. 4.       Do not drink contaminated water 5.       Store enough food for emergency 6.       Cooperate and help your neighbours
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