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.
39. Consider in Figure 2 the greatest average dune height shown for an area of Titan dunes. That height is how many times higher than the greatest average dune height shown for an area of Desert C dunes?
Your Answer is
Correct Answer is D
Explanation
Looking at figure 2, the maximum ordinate dune height corresponding to Titan is about 200 m, and the maximum ordinate corresponding to Desert C is about 25 m, so you should choose more than 5 times as high