It seems interesting that undersea flows have at least one characteristic different from rivers: “While river floods on land can create natural levees a few meters tall, the levees formed by [undersea] turbidity currents can grow up to 100 m[eters] high.” There are several sites on Mars where channels with loops can be seen. Although the processes may be much different, it would be interesting to compare the height and relative size of the depositions within Mars’ channels—rivers versus undersea canyons.

John Gilbert
Pasadena, Calif