Why is mountain soil acidic?

Mountain soil, especially that found in the region of high rainfall are acidic. This is because the rainfall dissolves minerals from these soils (which are basic in nature), thereby increasing the acidity of these soils. Moreover, rainwater itself is acidic since it reacts with carbon dioxide present in the atmosphere to form carbonic acid, which is a weak acid. 

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bcoz,the rain is falling here directly and the rasin is acidic

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