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Humus is different from decomposing soil organic matter. The latter looks rough and has visible remains of the original plant or animal matter. Fully humified humus, on the contrary, has a uniformly dark, spongy, and jelly-like appearance, and is amorphous; it may gradually decay over several years or persist for millennia. [14]
However, high value applications have started to receive more attention, notably the use of humins in the preparation of catalytic materials [11] and in material applications (e.g. plastic reinforcement and construction materials).
The term comes from humus, which in turn comes from the Latin word humus, meaning "soil, earth". [1] Humic substances represent the major part of organic matter in soil , peat , coal , and sediments , and are important components of dissolved natural organic matter (NOM) in lakes (especially dystrophic lakes ), rivers, and sea water .
Organic matter, organic material, or natural organic matter refers to the large source of carbon-based compounds found within natural and engineered, terrestrial, and aquatic environments. It is matter composed of organic compounds that have come from the feces and remains of organisms such as plants and animals . [ 1 ]
A routine sample of Sabra hummus collected from a store last month tested positive for the Listeria monocytogenes.
By one estimate, one billion tons of plastic waste have been discarded since the 1950s. [52] Others estimate a cumulative human production of 8.3-billion tons of plastic, of which 6.3-billion tons is waste, with only 9% getting recycled. [53] It is estimated that this waste is made up of 81% polymer resin, 13% polymer fibers and 32% additives.
The humus layer is composed of fully decomposed plant material. Because of the slow and incomplete process of fungal decomposition, the humus layer is very thin. There is very little blending of material between the humus layer and the mineral soil below resulting in the absence of organic matter in the top mineral soil horizon.
Another common clue type is the "hidden clue" or "container", where the answer is hidden in the text of the clue itself. For example, "Made a dug-out, buried, and passed away (4)" is solved by DEAD. The answer is written in the clue: "maDE A Dug-out". "Buried" indicates that the answer is embedded within the clue.