Globálne problémy Zeme

Kategorie: Biológia (celkem: 970 referátů a seminárek)

Informace o referátu:

  • Přidal/a: anonymous
  • Datum přidání: 12. března 2007
  • Zobrazeno: 7242×

Příbuzná témata

Globálne problémy Zeme

Globálne problémi maju celosvetovy charakter.V nízkych vrstvách atmosféry je výskyt ozonu.16 až 48 km nad zemou je jeho pritomnosť nutná preto, že nás chrani pred nadmerným ultrafialovým žiarením. Proces začína dopadom ultrafialového žiarenia na molekulu kyslíka ktora sa potom ešte rozpadne na dalšie dve atomy kyslíka.Tieto atomi dalej reaguju z molekulami kysklíka za vzniku ozonu.Molekula ozonu sa pri dalšom stretnutí s ultrafialovým žiarením zase rozpadne na atomi a molekuli kyslíka.Dalšie ultrafialove žiarenie znova rozštiepi molekulu kyslíka na atom kyslíka za vzniku monooxidu, chloru a dvojatomové molekuli kyslíka.Jedina molekula monooxidu floru može sposobiť ako katalyzátor a vyvolať rozpad aj stotisíc molekul ozonu.Prebieha to tak ,že reaguje s kyslíkom za vzniku molekuly kyslíka a chloru.Voľný chlor potom napadá ozon.Ozon sústavne vznika a zase vysoko nad povrchom planéty , pričom sa ultrafialove žiarenie spotrebúva.Freony unikajú z povrchu zemehore do atmosféry a dostavajú sa až do ozonovej vrstvy.Ultrafialove svetlo po dopade na molekulu freonu (napr. trichloru a flormetanu)sposobuje odstupenie atomu floru.Toto žiarenie ma aj škodlive učinky sposobuje rakovinu a očný zakal , znižuje odolnosť organizmu proti infekčným chorobam.Poškodzuje rastliny.

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