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Arrange the layers of soil profile in sequence
Horizon O: ( Humus Layer, Sub Soil, Top Soil, Parant Materials )
Horizon A: ( Top Soil, Sub Soil, Humus Layer, Parent Materials )
Horizon B: ( Sub Soil, Humus Layer, Parent Materials, Top Soil )
Horizon C: ( Parent Materials, Humus Layer, Sub Soil, Top Soil )