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(C) The natural aging of a lake by nutrient enrichment of its water is known as $Eutrophication$. As a lake ages,it becomes warmer and shallower,and t

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Eutrophication

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(C) The natural aging of a lake by nutrient enrichment of its water is known as $Eutrophication$. As a lake ages,it becomes warmer and shallower,and the accumulation of nutrients like nitrogen and phosphorus encourages the growth of aquatic organisms. Over centuries,the lake basin fills with silt and organic debris,eventually transforming into land. This process is a natural phenomenon,but it can be accelerated by human activities,which is then called $Cultural$ or $Accelerated$ $Eutrophication$.

Column-$I$	Column-$II$
$(a)$ Haryana	$(1)$ Ozone hole
$(b)$ Chernobyl	$(2)$ Integrated organic farming
$(c)$ Garhwal	$(3)$ Radioactive waste leakage
$(d)$ Antarctica region	$(4)$ Chipko movement

Select the appropriate option regarding the natural aging of a lake.

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Column-$I$ Column-$II$
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