TOEFL Listening: ETS-TOEFL听力机经 - G47O3V96992554WXP$

In the lecture the professor discusses an event that occurred along a rift in East Africa. Place the stages of this event in order. A. Molten rock flowed into the rift and widened it. B. There was a brief period of inactivity. C. Seismic activity began 30 kilometers south of the northern volcanoes. D. There was a series of earthquakes near the northern volcanoes.