comment on the different horizontal layers in soil profile
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What is soil profile ?
A soil profile is a section showing the successive layers of soil which would appear if we cut straight down in the soil .
Soils are generally found in layers .They have four main layers as follow :-
Top soil - The top layer of this soil is very fertile as it contains humus , minerals , salt and soil moisture .
Sub soil - The soil which lies below the top soil is neither fiully weathered nor decomposed . It does not contain much organic matter and is therefore , not as fertile as top soil .
Weathered rock - Below the sub soil , lies the weathered rock consisting of large rocks and gravel .
Unweathered rock - Unweathered rock lies below the weathered rock .
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