Miks on vesi tähtis?

1. Milline tähtsus on looduses veel?
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2. Kui palju leidub looduses magevett võrreldes soolase veega? 
a)1/2   b)1/4   c)1/3  d)3/4

3. Miks on enamik maakeral leiduvast veest soolane?
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4. Nimeta, kust võib leida magevett!
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5. Kus on magevesi kõige puhtam? Miks?
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6. Põhjenda, miks on veekogude põhjas jahedam kui pinnal!
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7. Kus leidub veekogudes kõige enam hapnikku ja miks?
    Tee joonis oma väite selgituseks!

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8. Milline tähtsus on veekogudel Maa kliima jaoks?
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