Dynamic Mars

Tanya Harrison is one of three authors who contributed to the third chapter, "Martian Gullies and Their Connection with the Martian Climate," of "Dynamic Mars: Recent and Current Landscape Evolution of the Red Planet." This book presents the latest observations, interpretations and explanations of geological change at the surface or near-surface of this terrestrial body. These changes raise questions about a decades-old paradigm, formed largely in the aftermath of very coarse Mariner mission imagery in the 1960s, suggesting that much of the interesting geological activity on Mars occurred deep in its past, eons ago. The book includes discussions of Mars’ ever-changing atmosphere and the impact of this on the planet’s surface and near-surface; the possible involvement of water in relatively new, if not contemporary, gully-like flows and slope streaks; and the identification of a broad suite of agents and processes that are actively revising surface and near-surface landscapes, landforms and features on a local, regional and hemispheric scale.