Winds Storms And Cyclones (Ch -8 Revision)

Winds Storms And Cyclones (Ch -8 Revision)

Dear Students,

In this module, we will revise the concepts we have learned in Chapter 8:- Winds, Storms and Cyclones.

Summary of the concepts:-

• Properties of air

• Air around us exerts pressure. The pressure exerted by the atmosphere on every object on the earth's surface is called as atmospheric pressure.

• When the air is heated it expands. As a result, it occupies more space and becomes lighter in weight. Therefore, we can say that warm air is light in weight and cold air is heavy.

• Air expands on heating and contracts on cooling.

• As warm air rises up, air pressure at the place is reduced and the cooler air moves to that place.

Expansion and Contraction of air.

Warm air Rise up

Air around us exerts pressure.

1. Properties of Wind

• The moving air is called wind.

• Wind currents are generated due to the uneven heating of the earth.

• High speed wind is always accompanied by reduced air pressure.

• The speed of air or wind depends upon the difference between the pressures of the two regions. If the difference between the pressures increases, the speed of the air also increases.

2. Effects of wind

• Wind carrying water vapour bring rain.

• Although monsoon winds are important for agricultural purposes and in regulating the temperature conditions of a place sometimes excess of rainfalls and strong winds can lead to natural disasters such as thunderstorms and cyclones.

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A Sample Question:-

Which of the following plays an important role in the early warning systems for cyclone?

a) Helicopter

b) Satellite

c) Sub-marine

d) Movement of stars.

Few Sample Question

1) Riya kept an empty plastic bottle inside the freezer. After few hours she opened the freezer and found that the bottle had collapsed. Explain what could be the reason.

Q2) How do you think is the technology important in predicting the arrival of cyclone?

So Students,

With this we come to a closure of Revision.

Take care everyone!! Stay Safe!!

2. Properties of Wind