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Formation and Structure of Cyclones/Hurricanes Video Lecture | Class 7 Oxford Science: Chapter Notes, Worksheets & Tests
FAQs on Formation and Structure of Cyclones/Hurricanes Video Lecture - Class 7 Oxford Science: Chapter Notes, Worksheets & Tests
| 1. What is the formation process of cyclones/hurricanes? |  |
Ans. Cyclones/hurricanes are formed over warm ocean waters near the equator. The formation process begins when warm, moist air rises from the ocean's surface and starts to rotate due to the Earth's rotation. As the warm air continues to rise, it creates an area of low pressure. This low-pressure system draws in more warm air from the surrounding area, causing the rotation to intensify. This process continues, and if the conditions are favorable, a cyclone/hurricane is formed.
| 2. How are cyclones/hurricanes structured? | |
Ans. Cyclones/hurricanes have a well-defined structure. At the center, there is a calm area known as the eye. Surrounding the eye is the eyewall, which is a ring of intense thunderstorms. The eyewall is where the strongest winds and heaviest rainfall occur. Outside the eyewall, there are spiral rainbands that extend outward. These rainbands also bring heavy rainfall and strong winds, but they are less intense compared to the eyewall.
| 3. What are the main characteristics of cyclones/hurricanes? | |
Ans. Cyclones/hurricanes are characterized by strong winds, heavy rainfall, and low atmospheric pressure. The wind speed in a cyclone/hurricane can reach over 74 miles per hour (119 kilometers per hour) and can cause significant damage. The heavy rainfall associated with cyclones/hurricanes often leads to flooding. Additionally, the low atmospheric pressure at the center of the storm can cause a storm surge, which is a rise in sea level that can result in coastal flooding.
| 4. What factors contribute to the intensity of cyclones/hurricanes? | |
Ans. Several factors contribute to the intensity of cyclones/hurricanes. Warm ocean waters are a crucial factor as they provide the energy needed for the storm to strengthen. The temperature difference between the ocean surface and the upper atmosphere also plays a role. If this difference is significant, it allows the storm to grow stronger. Additionally, low wind shear (the difference in wind speed and direction at different altitudes) and high humidity are favorable for cyclone/hurricane intensification.
| 5. How are cyclones/hurricanes named? | |
Ans. Cyclones/hurricanes are named to help in their identification and communication. The World Meteorological Organization (WMO) is responsible for naming cyclones/hurricanes. They maintain a list of names that are used in a specific order. The names are typically chosen based on the region where the cyclone/hurricane occurs. In some regions, the names are predetermined, while in others, they are chosen by the national meteorological organizations. The names are reused after a certain period, except for any cyclone/hurricane that was particularly destructive, in which case the name is retired.
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