Discussion
The Indo-Gangetic alluvium is a productive aquifer system because it consists of
Answer: A
Correct answer: thick permeable sand and gravel with interbedded clay
The Indo-Gangetic plain is filled to great depth with alluvium laid down by the Himalayan rivers: permeable sands and gravels forming aquifers, separated by clay lenses that confine them locally. The combination of great thickness, high permeability and continuing recharge makes it one of the most productive aquifer systems in the world - and one of the most heavily over-exploited.
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