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1. What is the lecture mainly about?CorrectIncorrect
2. According to the professor, when did coal begin to form on Earth?CorrectIncorrect
3. According to the lecture, which of the following are stages in coal formation? Click on 3 answers.CorrectIncorrect
4. Why does the professor say this:CorrectIncorrect
5. Why does the professor say this:CorrectIncorrect