Geography • World GeographyHard
How do Quaternary glacial-interglacial cycles globally impact the coastal geomorphology and formation of Kerala's backwaters and low-lying estuarine plains?
A. Through eustatic sea-level fluctuations that repeatedly drowned coastal river valleys during interglacial highstands and exposed continental shelves during glacial lowstands✓ Correct Answer
B. By depositing thick glacial till sheets directly onto the Malabar coastal plains
C. Through glacial scour of granite bedrocks in the coastal plains
D. By causing permanent arid deflation of coastal sand dunes
💡 Solution & Explanation
Global sea-level changes during the Quaternary period were driven by successive glacial and interglacial phases that repeatedly drowned river mouths and carved low-lying estuarine networks. Mistaken concepts such as glacial till deposition or arid dune deflation do not align with the humid tropical geomorphology of the Malabar coast. Understanding coastal geomorphology is essential for analyzing deltaic formations and marine transgressions in Indian geography.
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