Page 196 - Science Class 08

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Some Natural Phenomena

• Lightning • Lightning Safety • Earthquakes
• Causes of Earthquake • Earthquake Terminology • Seismic Zones in India
• Preven ve Measures

All the ac vi es carried out by the nature are
referred to as natural phenomena. Day and
night, changes in season, rain, snowfall, etc. are
natural phenomena. These natural phenomena
do not cause any great impact on human
beings and environment. But, there are some
other natural phenomena like lightning,

earthquake, flood, landslide, volcanic erup on, Some mes, a huge amount of charge flings
etc. that cause a great destruc on to life, towards the earth to get neutralised in the
property and environment. In this chapter, you form of lightning. It becomes, some mes, very
will study about lightning and earthquake. much devasta ng.
LIGHTNING LIGHTNING SAFETY

You know that clouds gather electrical charges Lightening strike could destroy life and property.
both posi ve and nega ve which are produced It is therefore, necessary to take measures to
by the fric on between water droplets and air. protect ourselves.

A cloud may build up a posi ve charge or a One should note the following points to save
nega ve one or different charges. Some mes, himself from the hazards of lightning:
these clouds will accumulate charges un l
v The sound of thunder is an alert to rush to
sparks jump from one cloud to another of a safer place.
opposite charge and the charges are hentrolised.
v A er hearing the last thunder, one should
Such a spark or chain of sparks is called
wait for some me before coming out of
lightning.
the safe place.

196 Science-8