What is true about volcanism on Mars? (Check all that apply) Mars is the most volcanically active of the Terrestrial Planets. Many of Mars volcanos are located in a couple of volcanic provinces which overlie mantle hotspots. Mars had volcanism in the distant geologic past, but no longer does. Mars is currently volcanically active. The volcanos on Mars are associated with subduction zones. The volcanos on Mars are associated with seafloor spreading. Volcanism is responsible for the dendritic (branching) valleys seen on Mars.