TOEFL Listening: ETS-TOEFL听力机经 - T19_J_C8QN1LR3J1P$

Which of the following statements describe aspects of the theory of seafloor spreading? A. Land-based sediments are created as a result of natural forces. B. Continents slide beneath oceanic ridges, causing volcanic activity. C. The Earth's crust is constantly being destroyed and renewed. D. Volcanically active, mountainous ridges run through most of the Earth's oceans.