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UPSC Prelims 1990 · World Geography · Rocks, Quakes and Landforms
Match List I with List II: A. Mushroom Rocks · B. Cape Verde · C. Thar · D. Vosges — 1. Block type · 2. Low latitude desert · 3. Volcanic · 4. Wind erosion
- (a) 3 4 1 2
- (b) 3 2 4 1
- (c) 2 4 1 3
- (d) 4 3 2 1
Show the answer and explanation
Answer: (d) 4 3 2 1
Mushroom rocks – wind erosion · Cape Verde – volcanic islands · Thar – low-latitude desert · Vosges – block mountains.
The idea
A matching set can mix a process, a rock origin, a climate region and a structural mountain type. First decide which kind of description each place or feature requires. One secure match can then remove most of the answer codes.
Why the others are wrong
(a) Makes mushroom rocks volcanic.
(b) Makes mushroom rocks volcanic.
(c) Makes mushroom rocks a desert.
Elimination technique
Mushroom rocks match wind erosion, numbered 4. Only (d) begins with 4, so that secure match decides the code; the other three matches provide a cross-check.
Also know
Near-ground sand abrasion can narrow a rock’s base into a pedestal; yardangs are wind-eroded ridges and dunes are wind deposits. Cape Verde is a volcanic Atlantic island group off West Africa. The Thar is a hot desert, while the Vosges and Black Forest flank the Rhine rift. These represent separate formation processes.
🔒 Mushroom rocks (Sahara, Thar) = wind abrasion at the base.
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