551. _________ is the phenomenon where the earth retains heat.

A. Air pollution
B. Green house effect
C. Global effect
D. Land pollution
✅ The correct answer is option B.
The greenhouse effect is one of the main factors determining the temperature of a planet. It’s the phenomenon by which certain gases – so-called greenhouse gases – in the atmosphere trap heat that would otherwise escape to space, thereby keeping the planet warm.

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