“…Structural features include lobate scarps, high-relief ridges, and wrinkle ridges, with lobate scarps being the most widespread (Watters et al, 2009). Many of these structures, particularly the lobate scarps, are believed to have formed primarily in response to a decrease in planetary radius (Solomon, 1977;Solomon et al, 2008;Watters et al, 2004Watters et al, , 2009) that accompanied cooling of the interior over the course of the planet's evolution (Solomon, 1977;Hauck et al, 2004;Watters et al, 2004;Zuber et al, 2007).…”