Once thought dead, Mars spewed floods of lava big enough to bury Canada in recent geologic time, with many eruptions occurring during the past 10 million to 100 million years, and others perhaps within the last 3 million years. “Volcanism is therefore likely to be an active geological process in current geological time in a few localized areas on Mars,” concluded a new study by William K. Hartmann and Daniel C. Berman of the Planetary Science Institute in Tucson, Arizona.