A planet is closest to the Sun in its elliptical orbit when it is at
A) perigee
B) aphelion
C) apogee
D) perihelion
Question 2
The Northern hemisphere of Mars is at
A) a higher than average elevation and is covered with impact craters
B) a higher than average elevation and is relatively smooth
C) an average elevation and is covered with impact craters
D) a lower than average elevation and is relatively smooth