Question

Replace the following with a word or a phrase.
(a) air in motion
(b) the liquid used to test for carbon dioxide
(c) the layer of air surrounding the earth
(d) increase in the temperature of the earth's atmosphere
(e) harmful rays from the sun
(f) the amount of water vapour present in the air
(g) a poisonous gas given out from the exhaust pipes of cars.
(h) addition of harmful substances to the atmosphere

Answer 1

(a) Wind refers to the air in motion.
(b) Lime water is the liquid used to test for carbon dioxide.
(c) Atmosphere is the layer of air surrounding the earth.
(d) Global warming is the increase in the temperature of the earth's atmosphere.
(e) UV rays are the harmful rays from the sun.
(f) Humidity is the amount of water vapour present in the air.
(g) Carbon monoxide is a poisonous gas given out from the exhaust pipes of cars.
(h) Air pollution is the addition of harmful substances to the atmosphere.