What causes the landscape at White Sands New Mexico to constantly be changing?

White Sands National Park is known for its glistening white gypsum sand dunes, which are constantly shifting and changing due to the prevailing winds in the area. Several factors contribute to the dynamic nature of the landscape at White Sands:

1. Wind Erosion: The gypsum sand at White Sands is primarily derived from the erosion of nearby gypsum deposits, particularly the nearby Sierra Blanca and San Andres Mountains. The prevailing winds in the region, known as the "westerlies," pick up the fine gypsum particles and carry them eastward. As the wind loses its velocity, the sand is deposited, forming dunes and shifting landscapes.

2. Alkali Flat: The Tularosa Basin, where White Sands is located, is an endorheic basin, meaning that water does not drain out of the area through rivers or streams. Instead, it collects and evaporates, leaving behind salts, minerals, and gypsum. This process contributes to the formation of an alkaline flat, which enhances the movement of sand by winds.

3. Dune Formation and Migration: The strong winds in the area continuously sculpt the gypsum sand into various dune forms, including linear dunes, star dunes, and parabolic dunes. These dunes can reach heights of up to 60 feet and are not fixed in place. Instead, they are subject to constant movement and migration due to the shifting wind patterns.

4. Vegetation: The vegetation in White Sands plays a role in stabilizing some of the dunes. Plants, such as the yucca and bunchgrasses, help trap the sand and reduce erosion. However, vegetation is relatively scarce in the park due to the challenging environmental conditions, further allowing the wind to reshape the landscape.

5. Gypsum Crystals: The gypsum sand at White Sands is composed of fine, individual gypsum crystals. These crystals are lightweight and easily transported by winds. When the wind carries the sand, it causes a "sandblasting" effect, wearing down exposed surfaces of rocks and other objects in the area, contributing to the ever-changing landscape.

In summary, the unique combination of wind erosion, alkaline flats, dune formation and migration, vegetation patterns, and gypsum crystals makes White Sands a dynamic landscape that is constantly evolving and shifting, offering a unique and fascinating natural wonder for visitors to experience.