Tag: evs - i

The greenhouse gases are capable of trapping and reflecting the sun's radiations on the earth's surface. Examples include carbon dioxide, methane, nitrous oxides etc. These are naturally released by activities like volcanic eruptions, forest fires, respiration etc. But their increased levels have occurred due to the anthropogenic activities like deforestation, increased use of refrigerators (releasing CFCs) and increased combustion of coal and petroleum (releasing oxides of nitrogen, sulphur and carbon). Because of the increase in their levels, they have caused climate change by global warming.

Soil erosion is removal of top soil by agency of water (water erosion) and wind (wind erosion). Soil erosion is of two types- natural and anthropogenic. Natural or geological erosion is extremely slow removal of top soil due to rain water or wind. Anthropogenic soil erosion is caused by removal of plant cover through over grazing, litter collection, tree felling, leaving the soil unprotected during agricultural operations.

Soil erosion is the removal of top soil by the agency of water (water erosion) and wind (wind erosion). Soil erosion is of two types, natural and anthropogenic. 

Soil erosion involves the removal of the top layer of soil which adversely affects the fertility of the soil. Heavy rainfall leads to splashing of soil. However, the majority of the soil splashed is not immediately lost from the field. Most of the splashed soil particles don't leave the field, they clog surface pores, which in turn reduces water infiltration, increases water runoff, and increases soil erosion.

Soil erosion is removal of top soil by agency of water (water erosion) and wind (wind erosion). Soil erosion is of two types- natural and anthropogenic. 

The top layer of the soil is the vital component, since all the nutrients required by plants are present in this layer. The loss of topsoil or disturbance of soil structure is known as soil erosion or land erosion. Water erosion is the removal of soil from the lands surface by running water, including runoff from melted snow and ice. Soil erosion by wind is common in dry arid regions where soil is chiefly sandy and the vegetation is very poor or even absent. Fossilization is the alteration of an organism's remains, impressions or activities by physical, biological or chemical changes retaining the original material in some form. Leaching is the process of extracting minerals from a solid by dissolving them in a liquid, either in nature or through an industrial process. Calcification is the accumulation of calcium salts.

Interaction of biotic and abiotic components result in a physical structure, that is characteristic of each type of ecosystem. Components of ecosystem function as one single unit. Four important functional aspects of the ecosystem are (i) Productivity, (ii) Decomposition, (iii) Energy flow and (iv) Nutrient cycling. Ecological pyramids are a graphical representation of a number, biomass, and energy flow in an ecosystem.

Environment is living things and what is around them. It includes physical, chemical and other natural forces. Living things do not simply exist in their environment. They constantly interact with it. Organisms change in response to conditions in their environment. In the environment, there are interactions between plants, animals, soil, water, temperature, light and other living and non-living things. 

Biosphere is biologically inhabited part of earth along with its physical environment consisting of lower atmosphere, land and water bodies.