Question 2:

Major air pollutants include ______, ______, ______.

Question 3:

_______and ________  permanently harm the surrounding soil. The surface is exposed to erosion, which destroys the quality of the land. The chemicals due to these practices leak into soil, which pollutes it and also, the nearby water bodies.

Question 4:

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

Question 5:

Emissions from _______, ________ and manufacturing activities release high levels of carbon monoxide, organic compounds, and chemicals into the air.

Question 6:

________  are also crucial for economic development of a country as they contribute to urbanisation, industrialisation, transportation and communication systems, and it becomes important that ______ are sustainably used.

Question 7:

The word ____ is derived from a latin word ‘solum’ meaning earthly material in which plants grow.

Question 8:

 ______ is the ultimate source of all food production, since plants form the base of all ecological food chains and plants grow in ______ and derive nutrition from it. Humans depend on ______ for food, clothing, furniture, medicine etc. Even other animals, insects receive food by grasing on plants.

Question 9:

The zone above troposphere is called the ________. It is rich in ozone gas, which forms the ozone layer. 

Question 10:

______ minerals include iron, aluminium, copper, tin, nickel, silver, gold and platinum etc.