PREKAMBRIUM

9. června 2010 v 20:52 | REMI |  GEOLOGICKÁ OBDOBÍ
Prekambrium
Doba,kdy se začal vyvýjet život na Zemi ale doklady o živých bytostech jsou velmi vzácné.Během prvních milionů let byla naše planeta horká,roztavená a pro život nehostiná.Teprve když se ochladila sopečné plyny a vodní pára vytvořili vrstvu atmosféry a začaly vznikat první oceány.
  Asi před třemi miliardami let pokrývaly vetšinu zemského povrchu sopečné horniny a krátery a mnohé krajiny byly následkem sopečné činnosti  nestabilní.Začaly se však vytvářet pevné části kontinentů.
  Nejstarší formy života byli jednoduché buňky a bakterie.Složitější byňky s jádrem a řasyse vyvinuli teprve asi před jednou miliardou let.Mnohobuňečné rostliny a živočichové se mohli objěvit těsně před koncemprekambria - tp bylo asi pře 550 miliony let.
Světadíly
Světadíly se začaly vytvářet asi před třemi miliardami let.Před 900 miliony lety se spojili v jeden velký superkontinet Rodinii.Před 750 miliony lety ležela Rodinia napříč na rovníku ale začala se posouvat k 
jihu.Tím začala doba ledová (veraginská).Mezi 750 až 650 miliony let se Rodinia rozpadla na dvě poloviny ale na konci Prekambria opět tvořila souvislý kontinent
Život v Prekambriu
První živé organismi byli mikroskopické buňky.Před 3500miliony lety vytvořili zelené fotosintezující řasy vrstevnaté struktury zvané Stromatolity.Ty uvolňovaly kyslík a umožnili vnik dalších rostliny a živočichů.
Stromatolity

 Krajina v Prekambriu

Mapa Prekambria
 

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