Terms : Hide Images
| 5451799477 | Bioaccumulation | An increase in the concentration of a chemical in specific organs or tissues at a level higher than would normally be expected. | 0 | |
| 5451799478 | Bio magnification | Increase in concentration of DDT, PCBs, and other slowly degradable, fat-soluble chemicals in organisms at successively higher trophic levels of a food chain or web. | 1 | |
| 5451799479 | Desertification | Conversion of rangeland, rain-fed crop land, or irrigated Copland to desert like land, with a drop in agricultural productivity of 10% or more. It usually is caused by a combination of overgrazing, soil erosion, prolonged drought , and climate change. | 2 | |
| 5451799480 | Humus | Slightly soluble residue of undigested or partially decomposed organic material in topsoil. This material helps retain water and water -soluble nutrients, which can be taken up by plant roots. | 3 | |
| 5451799481 | Intercropping | Growing two or more different crops at the same time on a plot. For example, a carbohydrate rich grain that depletes soil nitrogen and a protein-rich legume that adds nitrogen to the soil may be inter cropped. | 4 | |
| 5451799482 | Salinization | Accumulation of salts in soil that can eventually make soil unable to support plant growth. | 5 | |
| 5451799483 | Soil | Complex mixture of inorganic minerals (clay, silt, pebbles, and sand), decaying organic matter, water, air , and living organisms. | 6 | |
| 5451799484 | Clear-cutting | Method of timber harvesting in which all trees in a forested area are removed in a single cutting. | 7 | |
| 5451799485 | Deforestation | Removal of trees from a forested area. | 8 | |
| 5451799486 | Strip-cutting | Variation of clear-cutting in which a strip of trees is clear-cut along the contour of the land, with the corridor being narrow enough to allow natural regeneration within a few years. After regeneration, another strip is cut above the first, and so on. | 9 |
