Solved UPSC CDS/OTA Question
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Q · Internal Structure of The Earthmedium · 45s
What is the asthenosphere?
TopicInternal Structure of The Earth
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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The asthenosphere lies just below the lithosphere and is part of the upper mantle. It is hot, partially molten, and mechanically weak, allowing lithospheric plates to move over it.
Final Answer: Option B - Semi-fluid upper mantle beneath lithosphere