«Maybe there's been
active tectonism that helped shape the landscape,» she says.
Two points: first, it seems to me that such gravity -
induced tectonism provides a far better, and less problematical, explanation for climate variations with Milankovitch cyclicities, including cyclical ice ages, than radiative forcing does.
Aside of that, I would assume that terrestrial volcanoes are more dependent on
plate tectonism than sea floor spreading per se.
While their surfaces show evidence of recent deformation —
tectonism — neither planet has plate tectonic activity because neither planet has a surface divided into plates.
«surficial erosion / deposition (as at Titan), crater relaxation (as at Enceladus), crustal recycling or
tectonism (as at Europa), or some combination of these processes.»