NCERT Class 9 Social Science Chapter 30 Tsunami – A Mega Catastrophe

NCERT Class 9 Social Science Chapter 30 Tsunami – A Mega Catastrophe Solutions to each chapter is provided in the list so that you can easily browse through different chapters NCERT Class 9 Social Science Chapter 30 Tsunami – A Mega Catastrophe and select need one. NCERT Class 9 Social Science Chapter 30 Tsunami – A Mega Catastrophe Question Answers Download PDF. NCERT SST Class 9 Solutions.

NCERT Class 9 Social Science Chapter 30 Tsunami – A Mega Catastrophe

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Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. CBSE Class 9 Social Science Solutions are part of All Subject Solutions. Here we have given NCERT Class 9 Social Science Textbook of India and The Contemporary World – I: History, Contemporary India -I: Geography, Democratic Politics – I: Political Science, Economics and Disaster Management. for All Chapters, You can practice these here.

Tsunami – A Mega Catastrophe

Chapter: 30





1. Tsunamis are caused due to under-sea earthquake.
2. On 26th December 2004 the tsunamis devastated the coastal areas of South and South-east Asia. It proved a Catastrophic Sunday.
3. Tsunami hit a dozen nations from Southeast Asia to Africa with nearly 166.165 dead in Asia.
4. The worst hit countries were Indonesia, Sri Lanka and India.
5. Energy released by the Dec. 26 earthquake was equivalent to:
Bolling 1,000 litres of water for each person in the world.
Annual production of 9,40,000 barrels of oll/day.
13 times the Krakatoa eruption in 1883.
40,000 ‘Little Boys’- the bomb dropped on Hiroshima.
A billion volts of lightning.
6. The Government of India has planned to install the early tsunami warning system.
7. The relief and rehabilitation operations are continue on war footing.
8. The UN said that the biggest disaster relief operation ever staged would be required for tsunami victims as the destruction is not confined to one country or nation.


Q. 1. What is a Tsunami?

Ans. A seismic sea wave or destruction tidal wave generated by under water earthquake is known as Tsunami.

Q. 2. What is the main cause of Tsunami?

Ans. Tsunami is generated in a body of water by an impulsive disturbance that vertically displace the water column.

Q. 3. What are a tectonic earthquake? 

Ans. Tectonic earthquakes are a particular kind of earthquake that are associated with the earth’s crustal deformation.

Q. 4. Name the factors which are caused Tsunami.

Ans. The factors are:

1. Earthquakes.

2. Landslides.

3. Volcanic eruptions.

4. Explosions.

5. Impact of cosmic bodies.

Q. 5. What is epicenter?

Ans. The point on the surface of the earth from where the seismic waves spread in radial motion. 

Q. 6. What is destructive plate boundary? 

Ans. A boundary where two plates are colliding and a subduction zone is created.

Q. 7. What is Richter Scale?

Ans. A scale which is used to measure the magnitude or the intensity of energy released by an earthquake.

Q. 8. What is tides?

Ans. The regular but periodic rise and fall of sea water as a result of gravitational force of the moon and the sun is called a tide.

Q. 9. What is known as faulting? 

Ans. A fracture in the rocks of the earth’s crust is known as faulting.

Q. 10. Which are coral bleaching area? 

Ans. Andaman and Nicobar islands are coral bleaching area.

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