Question

5. Answer the following questions in short.
a. List three main causes of change:


b. Give two examples for each of the following.
i. Man-made changes
ii. Reversible changes
iii. Undesirable changes

c. State one difference between desirable changes and undesirable changes.​

Answer 1

b.

i.Melting of glaciers due to global warming. Air pollution due to smoke created by burning of fuels and automobiles. Water Pollution due to draining of chemicals and wastes in the water bodies. Floods and droughts due to deforestation.

ii.Examples of reversible changes: Melting is when a solid converts into a liquid after heating. An example of melting is turning ice into water. Freezing is when a liquid converts into a solid.

iii.Undesirable change: The changes which are not desired to change is called undesirable changes. Ex: Earthquakes, hurrcanes, tsuanmi , rusting of iron, souring of milk, rottening of fruits etc.

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