How eluvial process determines the colour of E horizon lighter compared to O horizon?
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Possible duplicate of What is the difference between eluvium and alluvium? – arkaia Jan 25 '18 at 22:21
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What do E and O stand for? Maybe we can try to help make clearer what you're asking. – JeopardyTempest Jan 26 '18 at 07:08
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@SudheerMuthusamy Question is on topic AFAIK but the way you have written it makes it unclear. If you can clarify what those terms mean and adding a few references I (and maybe others) can reopen the question – Jan 27 '18 at 09:45
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The designations of soil horizons as E and O are standardized in several classification systems but it would help to define them. The eluvial horizon, or E horizon, occurs in some soils where strong leaching of clay minerals, oxides, and organic material leaves pale colored mineral grains. The O horizon is the uppermost layer containing large amounts of organic matter so it is dark. The Wikipedia "Soil Horizon" article is pretty good. – haresfur Jan 29 '18 at 02:49