Passage VII

Radar observations of Saturn's moon Titan have revealed landforms that resemble longitudinal sand dunes found in some deserts on Earth. Such dunes are produced when sand-size solid particles are deposited in linear parallel piles (see Figure 1). Figure 2 shows the average dune spacing and average dune height for each of a number of areas of dunes on Titan and in 4 deserts on Earth (Deserts A-D). Figure 3 shows plots of the surface elevation (elevation above a horizontal reference plane) across a 25 km wide perpendicular cross section of dunes on Titan and in Desert A.

38. According to Figure 3, across the 25 km wide cross section of dunes on Titan and in Desert A, how does the surface elevation of the Titan dunes differ, if at all, from the surface elevation of the Desert A dunes? The surface elevation of the Titan dunes is:

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

Looking at figure 3, it is easy to find that the two curves are staggered. The surface elevation of Titan is sometimes larger than that of Desert A, and sometimes smaller than that of Desert A, so only the description of option J matches figure 3