plate tectonics Meaning in the Cambridge English Dictionary
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Meaning of “plate tectonics” in the English Dictionary

"plate tectonics" in British English

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plate tectonicsnoun [U]

uk   /ˌpleɪt.tekˈtɒn.ɪks/  us   /ˈtɑːn-/ specialized
the ​study of how the ​surface of the ​earth is ​formed, how the ​separatepieces of it ​move, and the ​effects of this ​movement
(Definition of plate tectonics from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"plate tectonics" in American English

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plate tectonicsnoun [U]

 us   /ˈpleɪt tekˈtɑn·ɪks/
earth science the ​theory that the earth's ​surface is made of ​largelayers of ​rock that are always ​moving, causing earthquakes and volcanoes , and ​explaining the ​creation of the ​variedfeatures of the earth's ​surface
(Definition of plate tectonics from the Cambridge Academic Content Dictionary © Cambridge University Press)
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