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The start of the Deep Sea Drilling Project coincided with the development of the ideas of "global tectonics" or "plate tectonics," which had been mainly derived from geophysical data. The results of drilling have been able to confirm the ideas of plate tectonics and have been important in adding important information in many areas: the age of the oceanic crust, relative and absolute plate motions, composition of the oceanic crust, sources of magnetic anomalies, tectonics at subduction zones, and initiation of rifting.
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