20 (c) Replace the following with a word or phrase
the layer of air surrounding the earth
The layer of air surrounding the earth is called the Atmosphere
20(g) Replace the following with a word or a phrase.
a poisonous gas gave out from the exhaust pipes of cars
28. Replace the following with a word or a phrase.
f. indiscriminate cutting down trees
i. condition caused by excess rain in a region
94 Write the name which is given to the layer of air which surrounds the earth. What is the role of this layer?