On its icy surface, Uranus satellite Ariel has smooth valleys with few craters. Other areas are rough with many craters. Based on this, it can be concluded that
A) valleys are young and the rough areas are old
B) the valleys are old and the rough areas are young
C) both valleys and rough areas are young
D) both valleys and rough areas are old

Question

Quizplus · Accepted Answer

The smooth valleys with few craters suggest they are geologically younger, as they have had less time to accumulate impact craters compared to the rough, heavily cratered areas, which are older.

On Its Icy Surface, Uranus Satellite Ariel Has Smooth Valleys