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Water Borne Diseases:
Diseases like cholera and typhoid, as well as diarrhoea and dysentery, are spread through water. Germs of these diseases multiply in the gut of the infected person and come out in the faeces. Eggs of worms also come out in faeces.
If the infected faeces and urine are passed in an open field, as is unfortunately done in most of our villages, germs or eggs may be carried to the source of local water supply, such as ponds or'rivers. Bathing or washing of utensils in such water, or drinking it, can infect other people. Sornetinies in slum areas, the latrines are too close to handpumps and thus drinking water becomes a source of disease. It goes without saying that people who are obliged to live in such areas, or wh;have inherited a life style of using fields for toilet, are the ones . who suffer mob! from water borne sickness.
a. Which type of ripple marks would you expect to see on the bed of a river? Why? b. Which type would you expect to find on the floor of a standing body of water? Why? c.
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The Copernican Revolution: The Copernican model consisted of the Sun at the centre with the six planets, Mercury, Venus, the Earth with the Moon-round it, Mars, Jupiter and
Life of a Star: A young star is thought to be composed largely of hydrogen gas. Hence, the most likely place for a star to be born is in one of the numerous clouds of hydrog
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Mass communication: The well-known exponent of the role of mass media in development, Dr. Wilbur Schramm, who headed a team of experts to advise the development of infrastr
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