1. Quelle est la principale différence entre la croûte océanique et la croûte continentale en termes de composition ?
2. Quelle est la principale composition de la croûte océanique?
3. Quelle discontinuité sépare la croûte du manteau dans la structure interne de la Terre ?
Discontinuités majeures
Moho (~35 km), Gutenberg (~2900 km), Lehman (~5100 km)
Croûte océanique — composition?
Basalte et gabbro, textures microlitique/grenue
Altitudes extrêmes
Everest +8848 m, fosse Mariannes -11034 m
Discontinuités majeures — exemples?
Moho, Gutenberg, Lehman
Distribution bimodale
Océanique : -4500 m, continentale : +300 m
Convection dans le manteau — rôle?
Déplace les plaques tectoniques
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