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Definition of catastrophism noun from the Oxford Advanced Learner's Dictionary

catastrophism

noun
 
/kəˈtæstrəfɪzəm/
 
/kəˈtæstrəfɪzəm/
[uncountable] (geology)
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  1. the theory that changes to the earth’s crust (= surface) in the history of the planet were caused by sudden violent and unusual events
ripple effect
noun
 
 
From the Topic
Change, cause and effect
C2
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