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It is the process of separating colloidal and suspended impurities from water by passing it through a porous bed made of fine sand and other proper sized granular materials. Filtration is carried out in a sand filter. It consists of a top thick layer of fine sand, placed over coarse sand layer followed by gravel. Water comes from the top.
Small micro-organisms present in sand voids decompose organic matter and remove some of the biological impurities.
Vertical Stratification - Tropical Rain Forest In a tropical rain forest, vertical stratification is very clearly seen. In addition to the different layers described above, th
What is the greenhouse effect? The greenhouse effect is a phenomenon in which atmospheric gases like CO 2 trap reradiated heat from the Earth, much as the glass panes of a gre
What is Ventricular Septal Defect (VSD) ? VSD accounts for 15-20 per cent of all CHDs. The ventricular septum may be divided into a small membranous portion and a large muscula
Traumatology : This is the study of wounds. In other words we can say that traumatology is the study of wounds or injuries which can be caused by accidents or violence to a person
Which structures of a flowering plant give rise to (a) potatoes, (b) the fleshy scales of an onion? (a) A potato is a tuber formed at the end of an underground stem (b) O
What are intraspecific and interspecific ecological interactions? Intraspecific ecological interactions are those among individuals of the same species. Interspecific ecologic
What is Intracardiac Repair of Tetralogy of Fallot ? Technique : The essential steps are: (I) relief of right ventricular outflow obstruction, and (2) closure of ventricular
Objectives of psychological components It is essential to have objective scores, in order to identify and classify deficits in psychological components and processes. The nee
how does the digestive system of an arthropod operate
What are the main characteristics of the age pyramids of developed countries? In a stabilized human population the age pyramid has a narrower base as the reproduction rate is
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