| 41. | The mid-ocean ridge systems form new oceanic crust.
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| 42. | The volcanics originated as oceanic crust and seamounts.
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| 43. | Thus, it became widely accepted that ophiolites represent oceanic crust that had been emplaced on land.
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| 44. | The oldest oceanic crust is located in the Western Pacific and has an estimated age of.
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| 45. | The crustal thickness under the Agulhas Passage varies from which is equally normal for oceanic crust.
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| 46. | Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate.
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| 47. | It is thought that the melting and reworking of oceanic crust formed the early Archean continental crust.
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| 48. | It is thought that some hydrocarbon gases may be produced by serpentinite reactions within the oceanic crust.
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| 49. | Weakening and cracking of oceanic crust and upper mantle is likely to occur in the tensional regime.
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| 50. | It is now known that there are two kinds of crust : continental crust and oceanic crust.
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