Any interactives on this page can only be played while you are visiting our website. Kim Rutledge Humus, nonliving, finely divided organic matter in soil, derived from microbial decomposition of plant and animal substances. Students explore a map showing cropland density around the world. Humus, which ranges in colour from brown to black, consists of about 60 percent carbon, 6 percent nitrogen, and smaller amounts of phosphorus and sulfur. A biotic factor is a living organism that shapes its environment. a dark brown or black colloidal mass of partially decomposed organic matter in the soil. a paste or dip made of chickpeas mashed with oil, garlic, lemon juice, and tahini and usually eaten with pita. The People’s Choice 2020 Word Of The Year: 2020 Was A $#@#%%[email protected]! humus - matter formed by decaying leaves and other organic matter 184 were donated in April This month, we are on track to donate 186 home recent additions webmaster page banners feed a child Where a thin sheet of humus, fertilized by lemmings, has accumulated, a few flowering plants appear, but even so their brilliant flowers spring direct from the soil, concealing the developed leaflets, while their horizontally spread roots grow out of proportion; only the Salix lanata rises to 7 or 8 in., sending out roots I in. A dark-brown or black organic substance made up of decayed plant or animal matter. Humus: the portion of the soil caused by the decay of animal or vegetable matter. At each step up the food chain, only 10 percent of the energy is passed on to the next level, while approximately 90 percent of the energy is lost as heat. Humus significantly affects the bulk density of soil and contributes to its retention of moisture and nutrients. dead plant material such as leaves, twigs, pine needles, and bark that accumulates on the ground. There it says “humus is sometimes also used to describe mature, or natural compost extracted from a forest”. Meaning of humus. Menu. Describe 2020 In Just One Word? Although the terms humus and compost are informally used interchangeably, they are distinct soil components with different origins; humus is created through anaer… Some experts think humus makes soil more fertile. Fights Illness and Disease. Join our community of educators and receive the latest information on National Geographic's resources for you and your students. Definition of humus geology : a brown or black complex variable material resulting from partial decomposition of plant or animal matter and forming the organic (see organic entry 1 sense 1a (2)) portion of soil Examples of humus in a Sentence We Asked, You Answered. materials left from a dead or absent organism. the art and science of cultivating land for growing crops (farming) or raising livestock (ranching). When plants drop leaves, twigs, and other material to the ground, it piles up. Chemistry, Earth Science, Geology, Geography, Physical Geography, This lists the logos of programs or partners of NG Education which have provided or contributed the content on this page. It is a valuable constituent of soils. An Alternative Travel Itinerary for Mitt Romney, Studies on Homer and the Homeric Age, Vol. Definition of hummus : a paste of pureed chickpeas usually mixed with sesame oil or sesame paste and eaten as a dip or sandwich spread Examples of hummus in a Sentence Recent Examples on the … Meaning of hummus. When animals die, their remains add to the litter. Melissa McDaniel Copyright © 2011. Definition of humus noun in Oxford Advanced Learner's Dictionary. humus definition: 1. dark earth made of organic material such as decayed leaves and plants 2. dark earth made of…. inorganic material that has a characteristic chemical composition and specific crystal structure. Code of Ethics. Soil is one of the most important elements of an ecosystem, and it contains both biotic and abiotic factors. Plants drop leaves, twigs, and other nutrients found in humus or classroom,!, if asked, would probably check the Brockhaus Encyclopedia for an answer master these essential Terms! 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