Why is the southern hemisphere of Mars believed to be older than the northern?
A)The southern hemisphere is darker much like the lunar mare.
B)The southern hemisphere is more heavily cratered.
C)The northern hemisphere is higher, due to the Tharsis Bulge.
D)The northern hemisphere leans more away from the Sun in winter.
E)The south polar cap is much thicker than the north one.

Question

Quizplus · Accepted Answer

The southern hemisphere of Mars is believed to be older than the northern because it is more heavily cratered. Craters form over time as meteoroids and asteroids impact the planet's surface, so a heavily cratered area is usually an indication of a longer history. The southern hemisphere of Mars is believed to be older than the northern because it is more heavily cratered, indicating it has had a longer period of time for impacts to accumulate.

Why Is the Southern Hemisphere of Mars Believed to Be