Some changes are temporary while some other are permanent .
Some changes produce new substance while others do not .
Some changes are natural while others are made by human beings .
Some changes are desirable to us but some changes are not desirable .
Types of changes
slow and fast changes .
Reversible and irreversible .
Slow changes
Changes which take place over a long period of time {hours , days , month , year}are known as slow changes .
Examples :
Growth of nail and hair .
Changes of seasons .
germination of seeds .
Fast changes
Changes which take place within a short period of time {second or minutes } are known as fast changes .
Examples :
Bursting of balloon .
Breaking of glass .
Bursting of fire crackers .
Bursting of paper .
Reversible changes
changes which can be reversed {to back the original state} are known as reversible changes .
Example :
Touch me not plant {responding to touch}.
Stretching of rubber band .
melting of ice .