uestion's
1. How is our atmosphere different
from the atmospheres on Vertus
and Mars?
2. How does the atmosphere act as
a blanket?
3. What causes winds?
4. How are clouds formed?
5. List any three hunan activities
that you think would lead to air
· pollution.
Answers
Answer:
How is our atmosphere different form the atmospheres on Venus and Mars?
Ans. Our atmosphere contains gases like nitrogen, oxygen, carbon dioxide, water vapour and other gases in very small amount. Atmosphere of Venus and Mars have about 95% of carbon dioxide.
So life is not possible.
Q2. How does the atmosphere act as a blanket?
Ans. The atmosphere acts as a blanket in the following ways:
(1) It maintains the temperature on the surface of earth during day and night time.
(2) It contains Ozone in the upper layer which protects life from harmful ultraviolet radiation.
Q3. What causes winds?
Ans. The uneven heating of the atmosphere in different regions of the earth causes wind. The rotation of earth and presence of mountain ranges also helps in the formation of wind, its blowing direction.
Q4. How are clouds formed?
Ans. During day time water from different sources like pond, lake, river, sea, well etc get evaporated and this water vapour rises up with the hot air. At a particular height the air cools and the water vapour condenses to form minute droplets and form clouds. When these water-drops become heavy, they precipitate and fall down as rain.
Q5. List any three human activities that you think would lead to air pollution.
Ans. Three human activities which leads to air pollution are:
(1) Burning of fuels like coal, petroleum, kerosene.
(2) Smoke released from industries
(3) Emissions from vehicles.