Winds, Storms and Cyclones Class 7 Science Notes - Chapter 8

Air is defined as an invisible substance which surrounds the earth in the gaseous form. It is mainly a mixture of nitrogen and oxygen. Wind is defined as the moving air. Air exerts pressure. On heating, air expands and occupies more space. Whereas on cooling it contracts. The land near the equator warms faster during summer and therefore the temperature of the land is high when compared to the ocean water. The air over the land area heats and rises. The warm air is lighter than the cold air and causes the wind to flow from oceans to lands. These are called monsoon winds. These winds carry water and hence it rains.

Thunderstorms are seen in India frequently. It is because they develop humid, hot, and tropical areas. With the increase in temperature, the upward winds also increase. The water droplets are carried upwards by these winds to freeze and fall down again. This movement creates sound and lightning. The entire event is called thunderstorm. Nowadays with the help of advanced technology such as radar and satellites, it has become easy to monitor cyclone activities.

Few Important Questions

  1. How to find the direction of the wind at a given place? Explain two methods.
  2. Answer true or false –
    1. During the summer season, the wind flows from the ocean towards the land
    2. Indian coastline is vulnerable to cyclones.
  1. How are winds generated?
  2. What is the importance of making holes in hanging banners and hoardings?
  3. What is the procedure to help your neighbors in case cyclone approaches?
  4. Explain the movement of air.

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Practise This Question

___________ cannot be further divided into simpler components. Whereas, ___________ is composed of two or more simple substances.