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How does leaching help to form podsol soil?

April 26, 2017earth form Geology help leaching Mathematics sciences soil

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How does leaching help to form podsol soil?

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Certain minerals (especially iron and calcium salts) are dissolved by rainwater and leach downwards in a soil, often leaving the top layers acid and a pale greyish colour. These leached substances often form a hard brownish layer deeper in the soil; this is known as a ‘hardpan’.