Презентация к уроку английского языка "NVIRONMENTAL POLLUTION" - скачать бесплатно

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Water Pollution Contamination of water by addition of undesirable organic, inorganic or biological substances to water sources Natural sources: soil erosion, leaching of minerals from of rocks and decay matter. Industrial effluents Destroys ecosystem and effects human health

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Sources of water pollution Community waste waters Industrial wastes Agricultural sources Under ground water pollution Marine pollution Thermal pollution

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Soil pollution Undesirable change in the physical, chemical or biological property which adversely affects its productivity Caused by dumping of wastes, agrochemicals and as indirect result of air pollution

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Sources of Soil Pollution Domestic wastes Agricultural wastes Industrial wastes Excretory products Salination

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Radioactive pollution Physical pollution that affects air, water and soil. Caused by ionizing radiations of harmful nature emitted from disintegrating atomic nuclei. The natural sources include cosmic rays that reaches the earth surface and radiations from radium 224, uranium 235 thorium 232 etc

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Man made sources Nuclear weapons Reactors and Nuclear fuel Waste waters containing these wastes X-rays used in medical practices Ultra violet rays present in solar radiations

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Effects Mutation Cancer Radioactive substances in food chain cause retarded growth and bone cancer. Increases infant mortality rate

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Noise pollution Unwanted high pitch sound that pollutes the environment. Maximum tolerable intensity of sound is 85 decibels The main sources are automobiles, aero planes, loudspeakers, industries and other electro-mechanical devices.

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Effects of noise pollution Damage to ear drum and impairment to hearing. Damages heart, liver and brain Emotional disturbances and behavioral changes Leads to anxiety and stress