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When does greenhouse effect happen?

a. Greenhouse gases on the surface absorb heat from the atmosphere.
b. Greenhouse gases on the surface absorb heat from the earth’s interior.
c. Greenhouse gases in the upper atmosphere absorb heat from outer space.
d. Greenhouse gases in the lower atmosphere absorb heat from the earth’s surface.



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Letter a - because as the carbon dioxide and other gases goes up int the air , it trapped in the ozone layer and as it is absorb , greenhouse takes place. 

some of this is a bit confusing , just refer in the book of G9 students.

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