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Tonian: Quiz

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Question 1: The Tonian (from Greek tonas, "stretch") is the first ________ period in the Neoproterozoic Era and lasted from 1000 Ma to 850 Ma (million years ago).
GeologyEarthEarth scienceNature

Question 2: Events leading to the breakup of supercontinent ________ started in this period.
KenorlandLaurasiaRodiniaPangaea

Question 3: Instead of being based on ________, these dates are defined by the ICS based on radiometric chronometry.
GeologyStratigraphyFossilGeologic time scale







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