continental margin

zone of the ocean floor that separates the thin oceanic crust from thick continental crust

en-GB/ˌkɒntɪˈnɛntəl ˈmɑːd͡ʒɪn/
en-US/ˌkɑntəˈnɛntəl ˈmɑɹd͡ʒən/

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