GRE Text Completion: JiJing 1373-GRE填空机经1373题 - A46FW617K4E3SPZNA

In the solar system, collisions involving cosmic system objects are among the most ____________ processes shaping surfaces: images of many solar system objects show a proliferation of impact craters formed throughout the past 4 to 5 billion years. A. cataclysmic B. pervasive C. misleading D. uncontrollable E. vivacious