Реферат по английскому: AIR CONTAMINATION CAUSED BY HUMAN ACTIVITY


  • Тип работы: Реферат
  • Предмет: Английский
  • Описание работы: Insertion into atmosphere or the creation of the chemical agents and substances caused by natural, and anthropogenous factors forms an air contamination. The natural sources of contamination of an atmosphere are volcanos, wood fires, dusty storms, a weathering etc. These factors do not threaten with negative consequences to natural ecosystems, except some catastrophic natural phenomena. For example, the eruption of a volcano Cracatao in 1883, when into atmosphere 18 km cubes of ashes powder were thrown out ; eruption of a volcano Catmay (Alaska) in the 1912 that had thrown out 20 km cubes of friable products. The ashes of these eruptions were spread over large part of the surface of the Earth and has caused the reduction of solar radiation by 10-20 % that accordingly has caused in northern hemisphere reduction of annual average temperature of air by 0.5 C.
  • Язык: английский
  • Тип файла: doc (Microsoft Word)
  • Размер файла: 34 Кб (в zip архиве - 9 Кб )
  • Добавлена: 22.02.2014
  • Скачана: 10 раз
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