Field Studies - Dune Worlds: How Windblown Sand Shapes Planetary Landscapes - page 188

Fig. 16.15 Rapid aeolian changeon Mars: a timelapse pair of images
taken by the Spirit rover on Mars, five days apart. These images are
analyzed in Sullivan et al. (2008) to determine a *2 cm ripple

movement. The movement is easy to observe by blinking images back
and forth, but takes close scrutiny on the printed page, so we have
added an arrow. Image NASA/JPL

Fig. 16.16 The quick and easy way to measure how much regolith overlies an ice layer in the frozen northern plains of Mars. The dirt has been
blown away by the exhaust plumes from the landing rockets (the nozzles of which are just visible at top) of the Phoenix lander in 2008. NASA/
JPL/U.Arizona