Question

What is a cyclone?
A. Specific air formation when the pressure at an area is less than the surrounding regions
B. Specific air formation when the pressure at an area is high than the surrounding regions
C. Rainfall
D. All of the above

Answer 1

Hint: When air moves, it is called wind. Due to the differences in atmospheric pressure, the air is set in motion. Many factors affect the velocity and direction of the wind. These are the pressure gradient force, Frictional force, Coriolis force, and Pressure and wind.

Complete answer:
Water takes up heat from the atmosphere to change into vapor just before cloud formation. This heat is released into the atmosphere when water vapor changes back to liquid form as raindrops. This heat warms the air around. The air tends to rise and causes a drop in pressure causing more air to rush to the center of the storm. This cycle is repeated. With the formation of a very low-pressure system with very high-speed winds revolving around it, the chain of events finally ends. It is a weather condition that we call a cyclone. Cyclones are specific air formations when the pressure at an area is less than the surrounding regions.
The increased wind speed is always accompanied by reduced air pressure. Air moves from the region where the air pressure is high to the region where the pressure is low and subsequently, the greater the difference in pressure, the faster the air moves. A cyclonic circulation is called the wind circulation around a low, whereas anticyclonic circulation is called wind circulation around a high. Around such systems, the direction of winds changes according to their location in different hemispheres. The wind circulation on many occasions around low and high at the earth’s surface is closely related to the wind circulation at a higher level. Generally, over a low-pressure area, the air will converge and rise. Over a high-pressure area, the air will subside from above and diverge at the surface. The middle latitude or extratropical cyclones are called the systems developing in the mid and high latitude, beyond the tropics. In tropical areas, violent storms that originate over oceans and move over to the coastal areas bring about large-scale destruction caused by very heavy rainfall, violent winds, and storm surges are Tropical cyclones.

Thus, option (A) is correct.

Note: Factors like humidity, wind speed, wind direction, and temperature contribute to the development of cyclones. During the winter months in India, the western cyclonic disturbances enter from the northwest and the west. These are brought in by the westerly jet streams and originate over the Mediterranean Sea.