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Doubt Clearance Thread: UPSC 2021

QUESTION 22. 

The boundary between Indian and the Antarctic plate is marked by oceanic ridge. What type of plate boundary makes it possible?

a) Continent-Continent convergence

b) Continent-Oceanic convergence

c) Continent-Oceanic divergence

d) Oceanic-Oceanic divergence

Correct Answer:D

this could be an elementary question, but could someone explain why the answer should be D and not C instead? 

since, the India-Australia plate is a continental plate and the Antarctic plate is an oceanic plate, should not the plate boundary be continent-ocean divergence instead?

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QUESTION 22. 

The boundary between Indian and the Antarctic plate is marked by oceanic ridge. What type of plate boundary makes it possible?

a) Continent-Continent convergence

b) Continent-Oceanic convergence

c) Continent-Oceanic divergence

d) Oceanic-Oceanic divergence

Correct Answer:D

this could be an elementary question, but could someone explain why the answer should be D and not C instead? 

since, the India-Australia plate is a continental plate and the Antarctic plate is an oceanic plate, should not the plate boundary be continent-ocean divergence instead?

Isn’t the answer C?

Ah, if isn't one of the greats of the community!

Its a question from an IASbaba test, I thought it should be C too, the explanation too was directly lifted the NCERT, doesn't help either

The Indian plate includes Peninsular India and the Australian continental portions. The subduction zone along the Himalayas forms the northern plate boundary in the form ofcontinent— continent convergence. In the east, it extends through Rakinyoma Mountains of Myanmar towards the island arc along the Java Trench. The eastern margin is a spreading site lying to the east of Australia in the form of an oceanic ridge in SW Pacific. The Western margin follows Kirthar Mountain of Pakistan. It further extends along the Makrana coast and joins the spreading site from the Red Sea rift south-eastward along the Chagos Archipelago.

The boundary between Indian and the Antarctic plate is alsomarked by oceanic ridge (divergent boundary)running in roughly W-E direction and merging into the spreading site, a little south of New Zealand. 

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@Celeborn thank you for the very clear explanation! It does make a lot of sense now. 


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QUESTION 22. 

The boundary between Indian and the Antarctic plate is marked by oceanic ridge. What type of plate boundary makes it possible?

a) Continent-Continent convergence

b) Continent-Oceanic convergence

c) Continent-Oceanic divergence

d) Oceanic-Oceanic divergence

Correct Answer:D

this could be an elementary question, but could someone explain why the answer should be D and not C instead? 

since, the India-Australia plate is a continental plate and the Antarctic plate is an oceanic plate, should not the plate boundary be continent-ocean divergence instead?

regarding why its D and not C...i think we shouldn't worry about if its named as a continental plate or oceanic plate. If we see the map, its "Oceanic" crust where the ridges are formed.....divergent or convergent... You can refer to a tectonic plate map in any standard atlas...its oceanic crust. Or the question framed might be wrong/ambiguous.


I thinkCeleborn'sexplanation clears things up. Thank you so much! 

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