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12. What is the lecture mainly about?CorrectIncorrect
13. According to the professor, how did the cycle of volcanic eruptions begin?CorrectIncorrect
14. Why does the professor say this:CorrectIncorrect
15. Listen again to part of the lecture. Then answer the question.
What does the professor mean when he says this:CorrectIncorrect
16. What were some effects of the eruption? Click on 2 answers.CorrectIncorrect
17. What can be concluded about Mount St. Helens?CorrectIncorrect