’ozone Essay, Research Paper
Qu’est-ce que la couche d’ozone?
L’ozone (O3) est un gaz incolore dont la formule chimique s’apparente a celle de l’oxygene (O2). L’ozone de l’atmosphere se trouve surtout dans la stratosphere, une couche de l’atmosphere situee entre 15 et 35 kilometres au-dessus de la surface de la Terre. Il est benefique a la vie sur la Terre car il absorbe les rayons ultraviolets (UV) nuisibles emis par le soleil. Par contre, l’ozone au niveau du sol, bien qu’il absorbe quelques rayons UV, est dommageable pour les organismes vivants. Cet ozone resulte de l’action de la lumiere du soleil sur les gaz d’echappement des vehicules. C’est une des principales composante du smog.
Ces derniere annees, on a vu se former chaque printemps un grand trou dans al couche d’ozone au-dessus de l’Antarctique. Un phenomene comparable d’appauvrissement de l’ozone, quoique moins marque, a egalement ete observe au-dessus des
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