Question 2:

The seas, ocean, rivers, lakes etc form the ________.

Question 3:

Soil is made up of four components: 1. ____ such as minerals, 2._____ such as humus, 3. air and water, and 4. _____ such as bacteria, and fungi.

Question 4:

Air gets polluted due to presence of pollutants in the _______ and it can result from both human and natural occurrences.

Question 5:

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

Question 6:

_______ acts as a universal solvent and gases such as oxygen, nitrogen, carbon dioxide and solids such as salts get readily dissolved with it.

Question 7:

Burning of ________, wood and rubber also release harmful gases and pollutes the air.

Question 8:

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

Question 9:

Air pollution causes a variety of environmental effects such as _______, ______, ________, damage to crops and forests, and climate change.

Question 10:

Water exists in three forms: solid, liquid, and ________.