PPT - Some Natural Phenomena Class 8 Notes | EduRev

Science Class 8

Created by: Dr Manju Sen

Class 8 : PPT - Some Natural Phenomena Class 8 Notes | EduRev

 Page 1


CHAPTER -15 
 
SOME NATURAL PHENOMENA 
Page 2


CHAPTER -15 
 
SOME NATURAL PHENOMENA 
1) Some natural destructive phenomena :- 
    Some natural destructive phenomena are cyclones, lightning, 
earthquakes etc. 
    Lightning is streaks of bright light  and sound caused by electric 
discharge between clouds and earth or between different clouds. 
   Earthquake is a sudden shaking or trembling of the earth caused by a 
disturbance deep inside the earth’s crust. 
   Lightning and earthquakes cause a lot of damage to human life and 
property.  
Page 3


CHAPTER -15 
 
SOME NATURAL PHENOMENA 
1) Some natural destructive phenomena :- 
    Some natural destructive phenomena are cyclones, lightning, 
earthquakes etc. 
    Lightning is streaks of bright light  and sound caused by electric 
discharge between clouds and earth or between different clouds. 
   Earthquake is a sudden shaking or trembling of the earth caused by a 
disturbance deep inside the earth’s crust. 
   Lightning and earthquakes cause a lot of damage to human life and 
property.  
2) Charging by rubbing (friction) :- 
     Some objects can be charged by rubbing with other objects. When 
objects are rubbed, they attract light objects like pieces of paper. This 
process is called charging by friction. 
   Eg :- A plastic refill, scale or comb when rubbed with dry hair, paper 
or polythene gets charge and attracts pieces of paper. 
   The charges acquired by rubbing are static charges. They do not 
move. When charges move, it is electric current.  
   Electric current is the motion of charges through a conductor. 
      
Page 4


CHAPTER -15 
 
SOME NATURAL PHENOMENA 
1) Some natural destructive phenomena :- 
    Some natural destructive phenomena are cyclones, lightning, 
earthquakes etc. 
    Lightning is streaks of bright light  and sound caused by electric 
discharge between clouds and earth or between different clouds. 
   Earthquake is a sudden shaking or trembling of the earth caused by a 
disturbance deep inside the earth’s crust. 
   Lightning and earthquakes cause a lot of damage to human life and 
property.  
2) Charging by rubbing (friction) :- 
     Some objects can be charged by rubbing with other objects. When 
objects are rubbed, they attract light objects like pieces of paper. This 
process is called charging by friction. 
   Eg :- A plastic refill, scale or comb when rubbed with dry hair, paper 
or polythene gets charge and attracts pieces of paper. 
   The charges acquired by rubbing are static charges. They do not 
move. When charges move, it is electric current.  
   Electric current is the motion of charges through a conductor. 
      
Page 5


CHAPTER -15 
 
SOME NATURAL PHENOMENA 
1) Some natural destructive phenomena :- 
    Some natural destructive phenomena are cyclones, lightning, 
earthquakes etc. 
    Lightning is streaks of bright light  and sound caused by electric 
discharge between clouds and earth or between different clouds. 
   Earthquake is a sudden shaking or trembling of the earth caused by a 
disturbance deep inside the earth’s crust. 
   Lightning and earthquakes cause a lot of damage to human life and 
property.  
2) Charging by rubbing (friction) :- 
     Some objects can be charged by rubbing with other objects. When 
objects are rubbed, they attract light objects like pieces of paper. This 
process is called charging by friction. 
   Eg :- A plastic refill, scale or comb when rubbed with dry hair, paper 
or polythene gets charge and attracts pieces of paper. 
   The charges acquired by rubbing are static charges. They do not 
move. When charges move, it is electric current.  
   Electric current is the motion of charges through a conductor. 
      
3) Types of charges and their interaction :- 
   There are two types of charges. They are positive charge 
(+) and negative charge (-). 
   Two charged bodies may attract or repel each other. 
   Like (similar) charges repel each other and unlike 
(dissimilar) charges attract each other.  
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