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Which of the following geographical features or phenomena is/are associated with the Peninsular Block of India?
1. Submergence of parts of the western coast due to tectonic activity
2. Presence of residual mountain ranges such as the Veliconda hills and Mahendragiri hills
3. Deep, V-shaped river valleys formed by fast-flowing rivers
Select the answer using the code given below:
Explanation
Statement 1 is correct: Since the Cambrian period, the Peninsular Block has largely stood as a rigid block. However, it has experienced some tectonic activity, notably the submergence of parts of its western coast beneath the sea and block faulting (e.g., rift valleys of the Narmada and Tapi).
Statement 2 is correct: The Peninsula is a highly denuded ancient landmass. It consists predominantly of relict and residual mountains, including the Aravalli hills, Nallamala hills, Javadi hills, Veliconda hills, Palkonda range, and Mahendragiri hills.
Statement 3 is incorrect: The river systems of the Peninsular Block are older and in their mature stage. Consequently, their river valleys are broad and shallow with low gradients, contrasting with the deep, V-shaped valleys formed by the youthful, fast-flowing rivers of the Himalayas.
PROVENANCE & STUDY PATTERN
Guest previewThis is a classic NCERT-based conceptual question. Statements 1 and 2 are direct lifts from Class XI Physical Geography. Statement 3 tests your ability to contrast Himalayan (youthful, V-shaped) and Peninsular (senile, broad) drainage systems. If you know the geomorphic age of the Peninsula, you can easily eliminate statement 3.
This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.
- Identifies the Peninsular Block as a rigid structure that has experienced submergence along its western coast.
- Attributes these changes to tectonic activity, specifically vertical movements and block faulting, without affecting the original basement.
- Explicitly cites the subsidence of the western flank of the Peninsula as a major geological event leading to its submergence below the sea.
- Links this tectonic subsidence to the early Tertiary period and the subsequent disturbance of symmetrical river plans.
- States that the Peninsular plateau has undergone recurrent phases of both upliftment and submergence.
- Directly associates these submergence phases with crustal faulting and fractures within the block.
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