Class 7 Exam > Class 7 Notes > Important Points - Winds, Storms & Cyclones
Important Points - Winds, Storms & Cyclones - Class 7 PDF Download
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.
FAQs on Important Points - Winds, Storms & Cyclones - Class 7
| 1. What causes winds to form? |  |
Ans. Winds are formed due to the uneven heating of the Earth's surface. When the sun heats the Earth's surface, different areas heat up at different rates. This leads to the formation of areas with different temperatures, which creates differences in air pressure. As air moves from high pressure to low pressure areas, winds are formed.
| 2. How are storms different from regular winds? | |
Ans. Storms are different from regular winds as they are characterized by a strong and violent disturbance in the atmosphere. While regular winds are usually mild and gentle, storms can be accompanied by heavy rain, thunder, lightning, and even tornadoes. Storms are often caused by the collision of air masses with different temperatures and humidity levels.
| 3. What are cyclones and how do they form? | |
Ans. Cyclones are large-scale weather systems characterized by low atmospheric pressure at the center and strong swirling winds. They are formed over warm ocean waters near the equator. The warm air rises, creating an area of low pressure. As more warm air rushes in to fill the gap, it starts to rotate due to the Earth's rotation. This rotation creates a spiral of winds around the center, forming a cyclone.
| 4. What are the impacts of cyclones? | |
Ans. Cyclones can have severe impacts on both human lives and the environment. They can cause widespread destruction by uprooting trees, damaging buildings, and causing flooding due to heavy rainfall. The strong winds associated with cyclones can also lead to storm surges, which can further damage coastal areas. Cyclones can disrupt transportation, communication, and power supply systems, leading to significant economic losses.
| 5. How can we prepare for cyclones and storms? | |
Ans. It is crucial to be prepared for cyclones and storms to minimize their impact. Some measures to prepare for such events include:
1. Stay informed: Stay updated with weather forecasts and warnings issued by meteorological departments.
2. Create an emergency kit: Prepare an emergency kit containing essential supplies like food, water, flashlights, first aid kit, and important documents.
3. Secure your property: Trim trees, secure loose objects, and reinforce doors and windows to prevent damage from strong winds.
4. Evacuate if necessary: If authorities issue evacuation orders, follow them promptly and move to a safe location.
5. Stay indoors during the storm: Seek shelter in a sturdy building, away from windows, and avoid going outside until the storm has passed.
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