Important Points - Winds, Storms & Cyclones Class 7 Notes | EduRev

Class 7 : Important Points - Winds, Storms & Cyclones Class 7 Notes | EduRev

The document Important Points - Winds, Storms & Cyclones Class 7 Notes | EduRev is a part of Class 7 category.
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Important Points:

Wind: Moving air is called wind.

  • Air exerts pressure.
  • Air expands on heating.
  • Warm air is lighter and rises up.
  • Air moves from high pressure to low pressure.

Air Current: Movement of air from high pressure zone to low pressure zone creates air current.

  • Uneven heating on land creates air current.
  • Air moves from 0-30° north and from 0-30° south towards equator.
  • Land gets heated as well as loses heat faster than water.

Monsoon: The flow of air from ocean towards land in summer is called Monsoon or Monsoon wind.

  • Monsoon winds carry vapour which falls over the land in the form of rain after cooling down.
  • In India harvest is depend on monsoon wind, which brings rain.
  • Thunderstorm: Rain with lightning is called thunderstorm. This happens mostly in the summer.
  • Thunderstorm occurs frequently in hot and humid tropical areas, such as India.

Cyclone: Fast moving air towards a circle usually with heavy rain is known as cyclone.

  • Wind direction, wind speed, humidity and temperature together creates cyclone.

Eye: Centre of cyclone is known as eye.

Tornadoes: Tornadoes are the very fast moving dark cloud in the shape of funnel. Tornadoes may form within cyclones.

  • The speed of violent tornadoes may be up to 300km.
  • Tornadoes are as destructive as cyclone.
  • Anemometer: An instrument which measures the speed of wind.
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