Recent Radar Observations of Mercury Have Suggested That Mercury May

Multiple Choice

Recent radar observations of Mercury have suggested that Mercury may

A) have one or more tectonic rift valleys.
B) have ice at its north and south poles.
C) have geologically recent lava flows on the side that was not photographed by Mariner 10.
D) not be precisely locked into its hypothesized 3-to-2 spin-orbit coupling.