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Thus, topsoil does not accumulate like most sediment, by simply piling up.In the case of erosion, the topsoil, of course, is removed.This is usually the fate of every plot of land which remains above sea level long enough.

It is deprived of oxygen and fresh organic material, such as rotting leaves.Such sediment, even if from nearby hills, would normally carry very little organic material as the weathering slopes, themselves, would not have much to begin with.Sediment, in the form of dust, would normally come from very dry areas where organic material would be quickly oxidized.Fewer roots now reach the parent rock, and, in the bottom layers, the organic content of the soil is greatly reduced.That means less chemical weathering from bacteria and fungi.

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