Correct Answer: Option (3) (a) - (iii), (b) - (i), (c) - (ii), (d) - (iv)
Detailed Explanation:
Geomorphological classification of plateaus based on their mode of origin and structural morphology:
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(a) Dome-shaped Plateau $\rightarrow$ (iii) Chota Nagpur Plateau:
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Formed when upward warping forces fold the crust into a broad structural dome, subsequent denudation exposing high peneplains (locally termed *Pats*, e.g., Ranchi plateau).
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(b) Volcanic Plateau $\rightarrow$ (i) Deccan Plateau:
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Formed through fissure-type quiet basaltic volcanism during the late Cretaceous period, depositing horizontal flood basalt sheets known as the Deccan Traps.
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(c) Step-like Plateau $\rightarrow$ (ii) Vindhya Plateau:
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Characterized by differential erosion acting upon alternating horizontal sedimentary strata (sandstone, limestone, shale), yielding a terraced, step-like topography.
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(d) Piedmont Plateau $\rightarrow$ (iv) Shillong Plateau:
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Plateaus situated at the foot of mountain chains, abutting plains or oceans on the opposite side (e.g., Shillong/Meghalaya plateau in the North-East).
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Hence, the matching sequence is (a) - (iii), (b) - (i), (c) - (ii), (d) - (iv).
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Intermontane Plateau: Enclosed completely by mountain ranges (e.g., Tibetan Plateau - highest and largest in the world).
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Roof of the World: Pamir Knot / Plateau in Central Asia.
