Definition of sand dunes:
It is a form of the Earth's surface that consists of loose sediments formed by various geomorphological processes, including weathering, erosion, and carving of earth's crust rocks. Then comes the role of the most important geomorphological factor in the formation of sand dunes, represented by the wind factor, which contributes to transporting the products of rock fragments and then depositing them in other areas that may It may be close or far from the source of its formation, depending on two factors. The first is the low wind speed, which leads to a weakening of its ability to carry sedimentary grains, so they fall to the ground. The other factor is the presence of obstacles or beams that stand in the way of the wind, leading to the depletion of its energy, so they are deposited in piles. And clusters, which, with successive deposition, form different shapes of sand dunes with different areas and heights.
Types of sand dunes:
1. Volcanic dunes
2. For occasional dunes
3. Longitudinal dunes
4. Parabola
5. Crescent dunes
