l'atmosphère


  • Comment définir une atmosphère ?

    1. Enveloppe gazeuse entourant une planète, en particulier la Terre. 2. Partie de l'atmosphère terrestre la plus proche du sol, dans laquelle se déroulent les phénomènes météorologiques.
  • Quel est le rôle l'atmosphère ?

    Le rôle de l'atmosphère : protéger contre l'irradiation et le vent solaire. Elle ne dépend que du bon vouloir du Soleil et de ses caprices plus ou moins périodiques. Tout ce qu'il nous envoie est ensuite filtré par les différentes couches de l'atmosphère notamment l'ozone, comme un gigantesque filtre à café.
  • Quelles sont les 7 couches de l'atmosphère ?

    3.1 Troposphère.3.2 Couche d'ozone.3.3 Stratosphère.3.4 Mésosphère.3.5 Thermosphère.3.6 Ionosphère.3.7 Exosphère.
  • L'atmosphère de la Terre est un mélange de gaz. Elle est constituée principalement de diazote (N2, 78 %) et de dioxygène (O2, 21 %) et de quelques gaz beaucoup moins abondants comme le dioxyde de carbone (CO2, 0,038 %) et des gaz rares comme l'argon (Ar, 1 %).
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