what makes the sand white in new mexico
White Sands, New Mexico The desert is located in the Tularosa Basin of New Mexico. Its white sands are not composed of quartz, like most desert sands, but of gypsum and calcium sulfate. Unlike other desert sands, it is cool to the touch, due to the high rate of evaporation of surface moisture and the fact that the sands reflect, rather than absorb, the sun's rays. At 1185 meters above sea level, there are approximately 442 square kilometers of dune fields and is known to be the world's largest surface deposit of gypsum.[5]
Tenochtitlan The Mexica saw this vision on what was then a small swampy island in Lake Texcoco, a vision that is now immortalized in Mexico's coat of arms and on the Mexican flag. Not deterred by the unfavourable terrain, they set about building their city, using the chinampa system (misnamed as "floating gardens") for agriculture and to dry and expand the island.