GEOLOGY

Detailed explanation-1: -Transport of Particles by Wind. Figure 10.24: Saltation moves sand-size particles along the desert floor or on sand dunes. Wind is able to transport the smallest particles of sediment, like silt and clay, over great distances and areas.

Detailed explanation-2: -Sand Dunes Wind commonly deposits sand in mounds or ridges called dunes. Dunes commonly form around a clump of vegetation or a rock-where the wind velocity is decreased (wind shadow). The wind drops its sediment load making the obstacle even larger-self-propagating process.

Detailed explanation-3: -Wind is a powerful agent of erosion. Aeolian (wind-driven) processes constantly transport dust, sand, and ash from one place to another. Wind can sometimes blow sand into towering dunes.

Detailed explanation-4: -Erosion occurs when rock particles are moved by an external force or agent. The agents of erosion are ice, water, wind, waves and gravity.

Detailed explanation-5: -Small particles may be held in the atmosphere in suspension. Upward currents of air support the weight of suspended particles and hold them indefinitely in the surrounding air. Typical winds near the Earth’s surface suspend particles less than 0.2 millimeters in diameter and scatter them aloft as dust or haze.