Thunderstorms can occur year-round and at all hours. But they are most likely to happen in the spring and summer months and during the afternoon and evening hours.
Fill in the blank: The main cause of wind movement is uneven_________.
Answer
The main cause of wind movement is uneven Heating.
wind currents are generated due to the uneven heating on the earth (i.e. between the equator and the poles and of land and water).
Why do you think that a steel skyscraper has no need for lightning rods?
Answer
Steel being a good conductor of electricity allows a clear passage of the energy of lightening to the ground without any damage. Therefore, they do not need lightning rods.
A land breeze occurs at night when the land cools faster than the sea. In this case, it is air above the warmer surface water that is heated and rises, pulling in air from the cooler land surface.
State an experiment to show that air exerts pressure.
Answer
Filling air in a football:A football filled tight with air, takes a shape of a sphere which is very difficult to press and can even support the weight of a player.
A thunderstorm is a storm with lightning and thunder. Its produced by a cumulonimbus cloud, usually producing gusty winds, heavy rain and sometimes hail.
State whether the following statements are True or False. If wind flows from land to the ocean, then it is day time.
Answer
False.
If wind blow from land to the ocean, then it is night time because at night, the water cools down more slowly than the land. So, the cool wind from the land moves towards the ocean.
In the wind flow pattern, it can be found that the wind shown is not in the exact North-South direction. Explain why.
Answer
It is because the winds would have blown in the North-South direction either from North to South or from South to North. A change in direction is however caused by the rotation of the earth.
To expel hot air out of the kitchen, $A$ has an exhaust fan fitted on the window of her kitchen and $B$ has a similar exhaust fan fitted on the wall near the ceiling of her kitchen. Which of the exhaust fan will expel the hot air more effectively? Explain why.
Answer
$B’s$ exhaust fan will expel the hot air more effectively because hot air rises up and her fan is at greater height than $A’s$.
Fill the missing word in the blank spaces in the following statements: Near the earth’s surface __________ air rises up whereas __________ air comes down.
Answer
Near the earth’s surface warm air rises up whereas cold air comes down.
Yes, despite their small size, all thunderstorms are dangerous. Every thunderstorm produces lightning, which kills more people each year than tornadoes.