Question 2:

Flow of air at high speed is called ______, and it is used to generate power by installation of  turbines.

Question 3:

Soil contains _____, ____, which provide a source for medicines, cosmetics, talcum powders etc.

Question 4:

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

Question 5:

Soil is classified on the basis of its nature and composition. In India we find six main types of soils: 1. _______ , which is rich in loam and clay; 2. _______ , which has predominantly clay; 3. ______, which is sandy to loam; 4. ______, which is stony sandy soil; 5. ______, which is sandy and poor in organic carbon; and 6. ________, which has porous clay rich in iron and aluminium hydroxides.

Question 6:

Sewage, fertiliser and agricultural run-off lead to increased growth of ______, which leads to eutrophication.

Question 7:

The air that we breathe is present in the first zone of earth known as _______. It is 10 to 12 km from the surface of the earth.

Question 8:

_____ 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 9:

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

Question 10:

__ % of earth’s surface is covered with water.