Geography • Physical GeographyHard
With reference to the morphogenetic regions of geomorphology and weathering processes, which of the following climatic zones exhibits the most intense chemical weathering rates, characterized by deep regolith profiles, leaching of silica, and accumulation of aluminum and iron oxides?
A. Arid desert zone with extreme diurnal temperature fluctuations
B. Periglacial zone subject to intense freeze-thaw mechanical shattering
C. Humid tropical zone featuring high temperatures and abundant precipitation✓ Correct Answer
D. Boreal taiga zone dominated by coniferous podzol soils
💡 Solution & Explanation
Humid tropical environments provide optimal conditions for chemical weathering because high ambient temperatures accelerate chemical reaction rates while abundant rainfall flushes soluble ions away, leaving behind insoluble sesquioxides of iron and aluminum in lateritic soils. Arid zones are dominated by physical weathering due to thermal expansion and salt crystal growth. Periglacial zones experience strong frost wedging. Boreal podzols undergo moderate chemical leaching under acidic coniferous litter.
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