The upper subsoil may or may not have mottles. Seasonal water table is between 12 to 24 inches. Poorly drained soils typically have a blackish surface layer that is underlain by a gray subsoil that is mottled. These soils have a water table at or near the surface for a significant portion of the year. soil feature unique to some coarse textured soils is a dark reddish or yellow layer often referred to as a rust line. This feature can form within the soil through two contrasting processes which may or may not be the result of a high water table.
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Knowledge center. Cod liver oil, as the name suggests, is the essential oil extracted from the livers of Atlantic cod (Gadus morhua). The oil is commonly taken as a dietary supplement. It is one of the best sources of omega 3 fatty acids (EPA and DHA) and contains relatively high amounts of vitamin A and vitamin D.The exact concentration of nutrients in cod liver oil depends on the species of Gadus family the oil comes from. 1.od liver oil may help promote cognitive performance. Cod liver oil contains a high amount of vitamin D. A link between vitamin D and cognitive performance was identified in a study published in the Journal of Neurology, Neurosurgery & Psychiatry.