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Oklahoma sits at a frequent crossroads between three different air masses: warm, humid air from the Gulf of Mexico; warm to hot, dry air from Mexico and the Southwestern U.S.; and cold, dry air from Canada. Especially from fall to spring, Oklahoma sees frequent air mass changes, which can produce drastic swings in both temperature and humidity.
Great Sand Dunes: Colorado: September 24, 2004: 107,345.73 acres (434.4 km 2) 493,428 The tallest sand dunes in North America, up to 750 feet (230 m) tall, were formed by deposits of the ancient Rio Grande in the San Luis Valley. Abutting a variety of grasslands, shrublands, and wetlands, the park also features alpine lakes, six 13,000-foot ...
Sand dune stabilization is a coastal management practice designed to prevent erosion of sand dunes. Sand dunes are common features of shoreline and desert environments. Dunes provide habitat for highly specialized plants and animals, including rare and endangered species. They can protect beaches from erosion and recruit sand to eroded beaches.
The dunes are believed to be remnants of a massive lake, Laka Alamosa, that dried up roughly 440,000 years ago, according to the park’s website.Over time, the park says wind, water and sediment ...
Health officials are warning of waterborne disease risks associated with splash pads and fecal matter after finding that more than 10,000 children and adults have been sickened over 25 years.
The height of the dune foot is basically determined by finding the intersection of the steep slope of the dune front and of the dry beach. In general, this theoretical dune foot point will be slightly below the sand. It is very difficult to redefine the height of the dune foot every year. Some administrators define the dune foot line as a ...
On Jan. 7, the Sahara desert witnessed an extremely rare snowstorm — just the third of its kind in 37 years — breaking a long snow drought in Algeria.
Limestone in light and dark beds 1 to 10 feet (0.30 to 3.05 m) thick give striped effect on mountainsides. Two quartzite beds, each about 3 feet (0.91 m) thick, near base, numerous sandstone beds 800 to 1,000 feet (240 to 300 m) above base. Top 200 feet (60 m) is well-bedded limestone and quartzite. Total thickness uncertain because of faulting ...