Why do the sand dunes in the west vary from those in the east in the figure below?

Question

Quizplus · Accepted Answer

The varying wind patterns play a crucial role in the formation and development of sand dunes. In the west, the winds are predominantly in one direction, leading to simple, linear or longitudinal dunes. In contrast, the winds blow in multiple directions in the east, creating more complex or star-shaped dunes. The other options, such as the size of sand clasts or the source area of the sediment, are unlikely to cause such drastic differences in dune morphology. There is also no significant difference in rainfall between the two regions that can explain the difference in dune pattern.

Why Do the Sand Dunes in the West Vary from Those