Page 201 - Science Class 08

v Wall clocks, photo frames, water heaters, If you are at home
etc. should be hanged at proper place so v Try to move out of the house. But, do not
that they could not fall on the people be panic. Move safely to an open place.
during an earthquake. v If you can’t get out safely, hide under a

v Some buildings may catch fire due to an desk or table. Cover your head to protect
earthquake. So, building especially high from falling objects.
rise buildings should be equipped with fire v Stay away from tall and heavy objects that
ex nguishes in working order. may fall on you.

During the Earthquake v If you are in bed, do not get up, cover your
head with a pillow.
You studied about the steps that should be
taken before the occurrence of the earthquake. If you are outdoors
But, if an earthquake occurs, what will you do v Move to an open area and stay away from
to protect yourself ? trees, buildings, poles, etc.

Let us know: v If you are in a moving vehicle, ask the
driver to move to a clear spot. Do not come
out of the vehicle ll the tremors stop.

1. What happens when an earthquake occurs?
2. Why earthquake is considered as the most destruc ve natural disaster?

3. What is the magnitude of an earthquake?

4. How can we measure the intensity of an earthquake?

Lightning : Discharge of a huge amount of charge gathered on clouds to the
earth
Lightning conductor : A simple device installed on rooftops to protect the structure from
lightning

Earthquake : A sudden movement or displacement of the ground produced by
abrupt displacement of rock masses, usually within the upper 15 to
20 km of the earth’s crust
Focus : The point within the earth from where seismic waves originate

Epicentre : The point on the earth’s surface that is directly above the focus
Magnitude : Earthquake magnitude is the measure of the strength of an
earthquake or the strain energy released by it
Seismograph : An instrument used to measure the magnitude of an earthquake

Intensity : It is a measure of the effects of an earthquake at a particular place

Science-8 201