| 21. | At this point basaltic oceanic crust begins to form between the separating continental fragments.
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| 22. | The feature they apparently formed is a 180-degree structure contains young oceanic crust exclusively.
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| 23. | The island is made of oceanic crust that formed at the Macquarie Triple Junction.
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| 24. | The North American Plate includes both continental and oceanic crust.
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| 25. | The islands rise from Jurassic oceanic crust associated with the opening of the Atlantic.
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| 26. | Most oceanic crust in the ocean basins is less than 200 million years old.
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| 27. | The last rocks to be slid across were slabs of oceanic crust, mainly basalt.
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| 28. | That, anyway, is classical plate tectonic theory, and it works fine for oceanic crust.
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| 29. | The oceanic crust is made up of rocks much younger than the Earth itself.
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| 30. | The oceanic crust is 99 % basalt, which is an igneous rock of mafic composition.
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