What are the relative ages of the heavily cratered Southern ...

[RYAN BANYAN]

What are the relative ages of the heavily cratered Southern highlands and the smooth Northern plains of Mars?
 
  A) the highlands and the plains are the same age
  B) it is impossible to tell unless we know the specific geological processes that occurred in each hemisphere
  C) the plains are older than the highlands
  D) the highlands are older than the plains

Question 2

The semi-major axis, a, of an elliptical planetary orbit is equal to the
 
  A) width of the ellipse
  B) distance between the planet and the Sun at perihelion
  C) average distance between the planet and the Sun
  D) distance between the planets and the Sun at aphelion

[fur]

Answer to Question 1

D

Answer to Question 2

C

[RYAN BANYAN]

Thanks for the timely response, appreciate it

[lkanara2]

TYSM