1. Quelle est la principale différence de composition entre la croûte continentale et la croûte océanique ?
2. Quelle particularité caractérise principalement la croûte continentale par rapport à la croûte océanique?
3. Quel phénomène est principalement associé à la zone de subduction ?
Distribution bimodale
Océans (~3800 m), continents (0-1 km)
Structure interne — composée de?
Croûte, manteau, noyau
Croûte continentale — composition ?
Granite, densité 2,7, quartz, feldspaths
Densité croûte océanique?
2,9, plus dense que croûte continentale
Séismes — onde P ?
Se propagent dans solides et vide, compression
Discontinuités — exemple?
Moho, gorge de Gutenberg
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