NCERT Important Questions Class 9 Science biology Chapter 14
Important NCERT Extra Questions
Chapter 14 Natural Resources
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
What is greenhouse effect?
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Greenhouse effect (= global warming) is keeping an area warm by allowing the solar radiations to pass in but preventing long wavelength heat waves to escape due to presence of radiatively active gases and glasspanes.