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Tema 9
 

Tema 9

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    Tema 9 Tema 9 Presentation Transcript

    • TEMA 9:LA HIDROSFERA TERRESTRE
    • Origen de la hidrosfera• Fa 4500 ma lactivitat volcànica i el bombardeig dasteroides i cometes fa que hi hagi CO2 i H2Ov a latmosfera.• Al refredar-se la Terra el vapor daigua passa a aigua líquida: Es forma la hidrosfera• La Tª mitja de 15ºC de la Terra fa que hi hagi aigua:• Gasosa (H2Og atmosfera)• Líquida (rius, llacs, aqüífers, mars...)• Sòlida (gel)
    • Característiques de l’aigua• Fonamental per als éssers vius• Dissolvent universal (sals minerals...)• Absorbeix gran quantitat de calor (atenua el clima)
    • Usos de l’aigua