How Are the Polar Regions of Mercury and the Moon

Multiple Choice

How are the polar regions of Mercury and the Moon similar?

A) Both are covered by huge mare-type basins from impacts.
B) Both seem to have ice pockets in the deepest, darkest crater floors.
C) Both have bright dry ice polar caps, like Mars.
D) Both have lakes of liquid water under their regolith.
E) Both have been hit by large comets that melted there.