Science glossary film: Oceanic crust

Oceanic crust

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The uppermost solid layer of the Earth beneath the oceans.

The uppermost solid layer of the Earth beneath the oceans. Its rocks are denser than continental crust and contain a high proportion of iron and magnesium. It is about 5 to 10 kilometres thick, and is constantly being formed at mid-ocean ridges and destroyed in subduction zones.

Its rocks are denser than continental crust and contain a high proportion of iron and magnesium. It is about 5 to 10 kilometres thick, and is constantly being formed at mid-ocean ridges and destroyed in subduction zones.

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