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By Anubha Kaushik; C.P. Kaushik
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Additional info for Basics Of Environment And Ecology (as Per New Syllabus, B. Tech. 1 Year Of U. P. Technical University)
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P. Districts Affected ••• Goa • •• ••• Karnataka •• 1– 40% 40–70% 70–100% Not known Tamil Nadu Kerala • •• The Number within each state is the fluoride range in drinking water. Source: UNICEF State of Art Report, 1999 Fig. 3. Fluorosis prevalent states of India. , all villages of the district are not monitored or samples are taken from some handpumps in a particular locality ignoring others. As per WHO estimates about 10 to 25% of rural population of various states is at risk. Health problems due to fluorosis: Fluoride expose may lead to dental (enamel) fluorosis and skeletal fluorosis (Fig.
G. graphite, diamond, quartz, feldspar. g. bauxite, laterite, haematite etc. Use of metals by human beings has been so extensive since the very beginning of human civilization that two of the major epochs of human history are named after them as Bronze Age and Iron Age. The reserves of metals and the technical know-how to extract them have been the key elements in determining the economy and political power of nations. Out of the various metals, those used in maximum quantity are iron and steel (740 million metric tons annually) followed by manganese, copper, chromium, aluminium and nickel.
G. iron, lead, aluminium, platinum. g. copper, lead, nickel. g. gold, silver, iron. g. steel alloys. g. zineb containing zinc, maneb containing manganese etc. g. gold, silver, platinum, diamond. g. graphite, diamond, quartz, feldspar. g. bauxite, laterite, haematite etc. Use of metals by human beings has been so extensive since the very beginning of human civilization that two of the major epochs of human history are named after them as Bronze Age and Iron Age. The reserves of metals and the technical know-how to extract them have been the key elements in determining the economy and political power of nations.