Read and download CBSE Class 11 Disaster Management Natural Hazards in NCERT book for Class 11 Other Subjects. You can download latest NCERT eBooks chapter wise in PDF format free from Studiestoday.com. This Other Subjects textbook for Class 11 is designed by NCERT and is very useful for students. Please also refer to the NCERT solutions for Class 11 Other Subjects to understand the answers of the exercise questions given at the end of this chapter
NCERT Book for Class 11 Other Subjects Natural Hazards
Class 11 Other Subjects students should refer to the following NCERT Book Natural Hazards in Class 11. This NCERT Book for Class 11 Other Subjects will be very useful for exams and help you to score good marks
Natural Hazards NCERT Book Class 11
Chapter 2
NATURAL HAZARDS - CAUSES, DISTRIBUTION PATTERN, CONSEQUENCE, AND MITIGATION MEASURES
The discussion on various terminologies has helped us in having a basic understanding of disaster management. However, each hazard has its own characteristics. To understand the significance and implications of various types of hazards we must have a basic understanding about the nature, causes and effects of each hazard type and the mitigation measures that need to be taken up. In this chapter, we would discuss the following hazards namely earthquake, tsunami, landslide, flood, cyclone and drought that we normally face in our country. Earthquake is one of the most destructive natural hazard. They may occur at any time of the year, day or night, with sudden impact and little warning. They can destroy buildings and infrastructure in seconds, killing or injuring the inhabitants. Earthquakes not only destroy the entire habitation but may de-stabilize the government, economy and social structure of the country. But what is an earthquake? It is the sudden shaking of the earth crust. The impact of an earthquake is sudden and there is hardly any warning, making it impossible to predict.
Cause of Earthquake :
The earth’s crust is a rocky layer of varying thickness ranging from a depth of about 10 kilometers under the sea to 65 kilometers under the continents. The crust is not one piece but consists of portions called ‘plates’ which vary in size from a few hundred to thousands of kilometers (Fig 2.1.1). The ‘theory of plate tectonics’ holds that the plates ride up on the more mobile mantle, and are driven by some yet unconfirmed mechanisms, perhaps thermal convection currents. When these plates contact each other, stress arises in the crust (Fig 2.1.2). These stresses can be classified according to the type of movement along the plate’s boundaries:
a) pulling away from each other,
b) pushing against one another and
c) sliding sideways relative to each other.
All these movements are associated with earthquakes.
The areas of stress at plate boundaries which release accumulated energy by slipping or rupturing are known as 'faults'. The theory of 'elasticity' says that the crust is continuously stressed by the movement of the tectonic plates; it eventually reaches a point of maximum supportable strain. A rupture then occurs along the fault and the rock rebounds under its own elastic stresses until the strain is relieved. The fault rupture generates vibration called seismic (from the Greek 'seismos' meaning shock or earthquake) waves, which radiates from the focus in all directions.
Please refer to the link below - CBSE Class 11 Disaster Management Natural Hazards
Other Subjects NCERT Book Class 11 Natural Hazards
The above NCERT Books for Class 11 Other Subjects Natural Hazards have been published by NCERT for latest academic session. The textbook by NCERT for Natural Hazards Other Subjects Class 11 is being used by various schools and almost all education boards in India. Teachers have always recommended students to refer to Natural Hazards NCERT etextbooks as the exams for Class 11 Other Subjects are always asked as per the syllabus defined in these ebooks. These Class 11 Natural Hazards book for Other Subjects also includes collection of question. We have also provided NCERT solutions for Class 11 Other Subjects which have been developed by teachers of StudiesToday.com after thorough review of the latest book and based on pattern of questions in upcoming exams for Class 11 students.
NCERT Book Class 11 Other Subjects Natural Hazards
The latest NCERT book for Natural Hazards pdf have been published by NCERT based on the latest research done for each topic which has to be taught to students in all classes. The books for Class 11 Other Subjects Natural Hazards are designed to enhance the overall understanding of students. All Class 11 NCERT textbooks have been written in an easy to understand language which will help to enhance the overall level of Class 11 students.
Natural Hazards NCERT Book Class 11 Other Subjects
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Class 11 Other Subjects Natural Hazards NCERT Book
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Class 11 Natural Hazards NCERT Book Other Subjects
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