What Can Be Said About Tectonic Activity on Ganymede

Multiple Choice

What can be said about tectonic activity on Ganymede?

A) Active volcanoes give evidence of current tectonic activity.
B) Young, lightly cratered terrain separating older more heavily cratered regions suggests tectonic activity in the past.
C) An intrinsic magnetic field suggests current tectonic activity.
D) Ganymede has a subsurface liquid ocean. This requires tectonic activity to provide the heat to keep the ocean from freezing.