24 Lug
A osservarla dall’alto, la Terra può a buon diritto essere chiamata pianeta “blu”: la superficie terrestre è infatti ricoperta per il 71% di acqua, per un volume pari a 1400 km3. Solo il 3% di questa acqua è però acqua dolce. Praticamente è come avere una vasca piena e poter disporre solo di un cucchiaino. […]
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