Page 114 - Genius Kidz Prudence Learning Sc-8

2. Fill in the blanks.

(a) ________________ is used to express the damaging power of an earthquake.
(b) ________________ is an earthquake under the sea.
(c) Richter scale was invented by ________________ .

(d) Most damaging earthquake reported in the history was of ________________ .
3. Match the columns.
Column A Column B

(a) Amplitude of largest seismic wave (i) Weaker boundaries of tectonic plates.
(b) Crust (ii) Seismograph
(c) Fault zones (iii) Nickel and iron

(d) Core of earth (iv) attract each other
(e) Intensity of seismic waves (v) Determine the magnitude of earthquake

(f) opposite charges (vi) Ferromagnetic
4. Mark the statements as True /False .

(a) Hypocentre is the point within earth crust where sudden shifting of rocks takes place.
(b) The destructive power of an earthquake is demonstrated by a seismograph.

(c) The vibrations that are felt during an earthquake are called tremors.

5. Discuss various precautions that can be taken at the time of an earthquake.

6. Find out what you mean by earthing and why it is required?
7. Very short answer type questions.

(a) What is a seismic zone?
(b) What is an earthquake?

(c) What do you mean by magnitude of the earthquake?
(d) What do you mean by squat position?

8. Short answer type questions.
(a) Discuss the term seismology.

(b) Name the four layers of Earth.
(c) Take a map of India and mark different seismic zones of India.
(d) Why are metal conductors installed on a building.

9. Long answer type questions.
(a) What is an earthquake? Discuss the different terms related to it.
(b) Explain the cause behind the earthquake.

(c) What is Richter scale? Explain it in detail.
(d) What are the different precautions that must be taken in regions that are prone to earthquake?
(e) Explain in detail why lighting occurs?

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