MAINS 2014
GS1
10 marks
Why are the world’s fold mountain systems located along the margins of continents? Bring out the association between the global distribution of Fold Mountains and the earthquakes and volcanoes.
WRITE IN
7 min
150 words
What the examiner wants
Explain why fold mountains occur along continental margins and relate their distribution to earthquakes and volcanoes.
Explain + Bring outMake clear how and why it happens: causes, process, and an example for each point. Make the main points or contrast clear with examples.
Demand-wise check
- 1Plate tectonics: fold mountains form at convergent boundaries, which lie at continental edges (ocean-continent: Andes, Rockies; continent-continent: Himalayas, Alps)≈30 words
- 2Geosyncline sediments compressed and uplifted at margins≈30 words
- 3Association: same convergent belts host earthquakes and volcanoes: Circum-Pacific belt and Alpine-Himalayan belt≈30 words
- 4Difference: ocean-continent margins (Andes) have volcanoes; continent-continent collision (Himalayas) has quakes but few active volcanoes≈30 words
Open in about 20 words and close in about 20.
Answer plan
Plate tectonicsWhy marginsTypes of convergenceGlobal beltsAssociation and exceptions
Where marks usually go
- No world map of belts
- Missing why the Himalayas lack active volcanoes while the Andes have many
Draw this
- World map showing fold mountains, plate boundaries, Ring of Fire and Alpine-Himalayan belt
Value addition
- DataAbout 90% of the world's earthquakes and about 75% of active volcanoes occur along the Pacific Ring of Fire.USGS
- ExampleNepal earthquake of April 2015 (magnitude 7.8) shows ongoing Indian-Eurasian plate collision.USGS, 2015
Mapped topper copies
Reviewed public-source references related to this PYQ. Same-syllabus references are labelled separately.
- Monika Srivastava · AIR 16 · Page 9 ↗Same syllabus reference
- Shakti Dubey · AIR 1 · Page 41 ↗Same syllabus reference
- Akansh Dhull · AIR 3 · Page 32 ↗Same syllabus reference
- Shakti Dubey · AIR 1 · Page 19 ↗Same syllabus reference
Links open original public sources. MainsBuddy does not host these answer sheets.
Next: plan for one minute, write it in 7 minutes, then get it checked.