1. Quelle est la différence d'épaisseur entre la croûte océanique et la croûte continentale ?
2. Quel est l'élément qui sépare la croûte terrestre du manteau ?
3. Quelle est la principale différence d'altitude entre les continents et les océans ?
Composition croûte océanique — éléments ?
Sédiments, basaltes, gabbros
Moho — définition?
Limite entre croûte et manteau.
Altitudes extrêmes — exemples ?
Everest 8 848 m, fosse des Mariannes -11 034 m
Croûte océanique — composition?
Basaltes, gabbros, faibles sédiments.
Distribution bimodale — caractéristiques ?
Continents 0-500 m, océans 4000-5000 m
Croûte continentale — composition?
Granite, roches métamorphiques.
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