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大洋型地壳,亦称洋壳,是深海或大洋底部特有的地壳类型。洋壳与陆壳不同,洋壳缺失花岗岩层(硅铝
Oceanic crust, also known as the oceanic crust, is a type of crust unique to the deep ocean or ocean floor. Unlike the continental crust and the continental crust, the granite layer is missing from the oceanic crust (Si-Al