Which of these Galilean satellites is most geologically active?
a. Io
b. Europa
c. Callisto
d. Ganymede
Question 2
The old surfaces of icy satellites of Jovian planets
a. appear dark in color with few impact craters.
b. appear dark in color with many impact craters.
c. appear very bright because ice is very reflective.
d. generally show long bright grooves and a modest number of impact craters.
e. generally have small volcanoes that are active.