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SAI INTERNATIONAL SCHOOL


                                                         CLASS -IV


                                             SCIENCE-HOME ASSIGNMENT

                                                     Chapter 13- Our Environment


                                                         Sub Topic- Air Pollution


                A. Fill in the blanks.

               1. Large scale cutting down of trees is known as ___________.

               2. The smoke given off by factories contain large amount of
                   ___________ which pollutes the air.

               3. ____________ eruptions release poisonous gases into the air.

               4. Air pollution causes breathing problems, such as__________.





               B. Answer the following questions.


               1. What do you mean by air pollution? List five causes of air pollution.


               2. List five effects of air pollution.
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