Question 2:

Use of pesticides, fertilisers pollute the air by releasing harmful _______ into it.

Question 3:

Industrial waste dumped into water bodies cause chemical imbalance, leading to _____ pollution.

Question 4:

The layer of air above the earth’s surface is called __________. 

Question 5:

______ leads to blocking of sunlight from entering water bodies and reduces oxygen values in water, which creates an inhabitable environment.

Question 6:

________ minerals include sand, gravel, cement, salt, sulphur, phosphorous, diamonds and gems.

Question 7:

_____ plays an important role in the water cycle as water gets evaporated from soil, oceans etc due to Sun’s heat and form clouds. The clouds get cooled by ____ and then these clouds shower as rains. So rainfall depends on the current of the ___.

Question 8:

Minerals such as _______ and ______ are important sources of energy. They are widely used in different sectors such as transport, agriculture and industry. 

Question 9:

____ is a good conductor of sound, we can hear speech or music or noise in the presence of _____.

Question 10:

Pollution from natural occurrences such as _____, _______, ______,  pollen dispersal, evaporation of organic compounds and natural radioactivity cause air pollution.