Advertisements
Advertisements
Question
Explain how global warming takes place in the presence of green house gases. Give a reason why the surface temperature of earth is maintained in absence of green house gases.
Advertisements
Solution
As light from the sun passes through atmosphere of earth most of the U.V. radiations are absorbed by ozone and only 30% of IR radiations reach earth’s surface and heat it.
As the earth becomes hot, it starts emitting radiations which have now less energy and hence longer wavelength. Some part of reflected IR radiations are absorbed by CO, and this remains on earth and warm up the earth’s surface.
In absence of green house gases surface temperature on earth is maintained. Since heat radiations absorbed after passing clear atmosphere reach earth and some heat., radiations are reflected back.
APPEARS IN
RELATED QUESTIONS
How will global warming affect the agriculture?
Write True or False.
Aeroplanes flying in the sky cause global warming.
Give a chemical test to distinguish between the following gases:
Sulphur dioxide and chlorine.
Global warming also refers to as ______.
Match the items of Column A with those of Column B.
| Column A | Column B |
| (a) sulphur dioxide | (i) damage ozone layer |
| (b) carbon dioxide | (ii) reduces oxygen-carrying capacity of blood |
| (c) carbon monoxide | (iii) acid rain |
| (d) chlorofluorocarbons | (iv) green house gas |
It is said, “CO2 contributes to global warming.” Explain.
We should plant trees and nurture the ones already present in the neighbourhood. Why?
CO2 and methane are directly contributing to global warming.
