From Hawai’i to the bend in the Hawaiian-Emperor chain is about4000 km. Use the speed of plate motion given in Problem 4 to estimate how long ago the direction of plate motion changed. (Note that the San Andreas fault in Southern California became active at about the same time!)
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4. The Hawaiian-Emperor chain of undersea volcanoes is about 7500 km long, and the Pacific plate is moving 9.2 cm a year. How old is the oldest detectable volcano in the chain? What has happened to older volcanoes in the chain?
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