| 1. | Oceanic crust has a smaller amount of silicon ( mafic rock ).
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| 2. | Melting occurred in deep sediments and in the basaltic oceanic crust beneath.
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| 3. | Geologically, an ocean is an area of oceanic crust covered by water.
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| 4. | These are aligned parallel to magnetic anomalies in the underlying oceanic crust.
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| 5. | The shallow structure of the oceanic crust is simpler than on land,
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| 6. | The subducted oceanic crust triggers volcanism, although the basic mechanisms are varied.
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| 7. | The Pacific Ocean floor subducted under this oceanic crust between the continents.
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| 8. | Oceanic crust is hydrothermally altered causing addition of quartz and sodium.
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| 9. | Oceanic crust is also denser than continental crust owing to their different compositions.
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| 10. | The combination of these processes recycles the oceanic crust back into the mantle.
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