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The author hypothesizes that the eight large craters in a long straight line were probably caused by volcanic events rather than meteorites. This is because the craters contain rocks that show characteristics that could have been caused by volcanic events, and the linearity of the craters make it unlikely that the craters had different causes. In addition, the craters are all of different ages.
The author assumes that craters in a straight line that are all of different ages are unlikely to be caused by meteorites slamming into earth. The author assumes that it is possible for volcanic events to produce craters in a straight line that are all of different ages. Another assumption is that there isn’t another more likely cause of the craters besides volcanic activity and meteorites.
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