Chapter 8 is about winds, storms, and cyclones. Students learn about the effects of cyclones on agriculture, communication, natural resources and other aspects. Origin of storm, and wind currents are some other topics covered in the chapter.
NCERT Chapter 8 also has a practise exercise at the end so that students can revise the concepts they have learned. Extramarks provides NCERT Solutions for Class 7 Science Chapter 8 to help students solve practise exercise questions accurately.
The solutions have been prepared by the subject matter experts at Extramarks who follow the latest CBSE guidelines. These solutions have all the answers to the NCERT textbook questions solved in a step-by-step manner, and explained with relevant examples, wherever required.
NCERT Solutions for Class 7 Science Chapter 8
Access NCERT Solutions for Class 7 Science Chapter 8 – Winds, Storms, and Cyclones
NCERT Solutions for Class 7 Science Chapter 8
The NCERT Solutions for Class 7 Science Chapter 8 by Extramarks help students in preparing for exams in a better manner. The answers are written in simple and easy language making it easier for students to understand the concepts and the important points easily and make them revise quickly.
Introduction
Chapter 8 of the Class 7 Science syllabus deals with the concepts of winds, storms, and cyclones. In this chapter, students learn how cyclones adversely affect the natural resources, agricultural activities, transport, communication, accommodations, and electric supply of a particular area. Students will study the definition of cyclones, the reasons behind cyclones, the definition of storms, and where does a storm originate from?
8.1 Air Exerts Pressure
Activity 8.1 is an experiment to show that air exerts pressure. While rowing a boat, one feels that the wind comes from behind because the wind pressure helps the boat row faster. The concepts involve many examples which we experience in our everyday life. The Class 7 students need to study the topics with time and care with reference to NCERT Class 7 Science Chapter 8 solutions.
8.2 High-Speed Winds are Accompanied by Reduced Air Pressure
Class 7 students have already studied how air moves from one place to the others, especially; from the high air pressure region to the low air pressure region. The bigger the pressure difference, the faster the air will move from high to low pressure. The activity illustrates various experiments to make the students understand that high wind speed is always a result of low air pressure. Students need to perform all the experiments under the guidance of their mentors for safety reasons.
8.3 Air Expands on Heating
Activity 8.3 deals with the theory that air expands and takes up more spaces when it becomes hot. When an element occupies more space, it becomes lighter. Therefore, we know that hot air is lighter than cold air. Let us understand the concept with a simple example. When you light up a lamp, the flame always rises upwards. The reason is the fire is warmer than the surrounding cold air. Students can learn the theories at ease with these simple examples.
8.4 Wind Currents are Generated Due to Uneven Heating on the Earth
The section includes two activities;
- Uneven heating between the Equator and the Poles:
Everyone knows that regions located near the equator receive the maximum heat from the Sun. The warm air blows through these places. When the hot air in these places rises, the cold air from the polar regions enters and takes its place. This is how the wind circulation passes from the poles to the warmer regions. Students need to study the diagram to understand the topics in-depth.
- Uneven heating between land and water
Similarly to the first one, the land warms up faster than the water. The wind temperature of land is always higher than that of water. For this reason, the air blowing over the land becomes heated and rises high. Simultaneously, the cold wind enters the land from the ocean. Then, the wind brings rain. The students can get more information about the winds which cause rain. The section is vital from the examination point of view.
8.5 Thunderstorm and Cyclones
Thunderstorms and cyclones are interconnected. The rising wind is often the result of high temperatures at any place. The winds carry water droplets most of the time. The droplets freeze and come downwards. The movement of the water droplets from the sky to the ground with rising air creates light and sound in nature. We call this natural phenomenon a thunderstorm.
The second section deals with the cyclone. Students learn about how thunderstorms result in cyclone. The students learn about the storm, its formations, and its causes.
8.6 Destruction Caused by Cyclones
Cyclones are catastrophic. It has different names in different parts of the world, for example, typhoons and hurricanes. Students learn about tornados in this section. A tornado is a funnel-shaped, dark cloud that extends from the sky to the ground. Sometimes tornadoes are formed within cyclones.
8.7 Effective Safety Measures
It teaches students about the safety measures for protection. When destructive storms and cyclones occur, this piece of information comes in handy. The safety measures include:
- Do not ignore the warnings from the meteorological department via electronic and print media.
- Keep the most necessary household items and an emergency kit ready in place in case you have to move on short notice.
- Store dry food items and drinking water.
- Do not touch electric lines or switches.
- If possible keep your mobile and other electronic devices charged. Maintain a hard copy of all the emergency numbers.
- Do not step out. Stay indoors.
- Be agile and alert. Try to help others.
8.8 Advanced Technology has Helped
Nowadays, advanced technology helps us to be safe and protected from natural calamities. The weather forecast within 48 hours and constant updates by various media enable people to take appropriate action and stay safe.
Key Features of NCERT Solutions for Class 7 Science Chapter 8
The key features of NCERT Solutions for Class 7 Science Chapter 8:
- Subject matter experts prepare the solutions.
- Solutions are made as per the latest CBSE guidelines.
- The answers are written in detail and in simple language.