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Grundvand & Søer

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by

Nynne Glahn

on 6 December 2013

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Transcript of Grundvand & Søer

Grundvand & Søer
Grundvand
Opsamling
grundvand og søer - hvad de betyder for hinanden
Hvordan søer opstår
Hvorfor
Intro
Vand er flere millioner år
Promille måler saltindholdet i vand
3 promille er det højeste mennesker kan drikke
70-75% af jord overfladen er dækket af vand
97% af vandet er i havene
3% er ferskevand (drikevand)
Intro forsat
Vands kogepunkt er ved 100 C
Vands frysepunkt er ved 0 C
Frossen vand vejer 9% mindre end flydende
Et vandmolekyle består af 3 atomer, 2 hydrogenatomer og 1 oxgygenatom
H20
Søer
Næringsffatige søer
Fotosyntese
Næringsrige søer
Dannes hele tiden
Full transcript