dissabte, 12 d’octubre de 2013

The water cycle


    Observem el diagrama del cicle de l'aigua




     

         Water cycle diagram




        • Ara són els alumnes que ens expliquen el cicle de l'aigua




        • Resoleu el següent qüestionari.

        •  Per saber-ne més llegeix aquestes afirmacions i després comenta-les amb els companys/es

         Did you know?

        •  A fixed amount of water recirculates around the Earth. 
        • Water moves in certain directions from place-to-place (reservoir-to-reservoir) by only certain processes and pathways.
        •  Some processes of transfer are rapid while others are much slower. 
        • A conceptual "reservoir" of water is not quite the same thing as a reservoir in which water is stored.
          When land-based glacial ice melts and runs off into the sea, sea level rises. 
        •  When land-based glacial ice forms, sea level drops. 
        •  When floating icebergs melt into the sea, sea level doesn't change.
        •  Glacial ice is made up of freshwater that had previously fallen as snow. 
        •  Evaporation of seawater requires an input of energy; condensation of clouds releases energy.


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