GRE Text Completion: JiJing 1373-GRE填空机经1373题 - M1L6F6866M34RLSYA

The reason geological activity on Mars is so (i)____________ while on Earth it remains (ii)____________ is that Earth's diameter is about twice the size of Mars. Because Mars is smaller than Earth, it cooled faster, and therefore it lost the internal heat that drives tectonic activity. A. localized B. vital C. moribund D. unnoticed E. violent F. predictable