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High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! In more arid regions, vegetative cover is generally sparse. Open spaces are usually covered by a biological soil crust or biocrust, a highly specialized community of cyanobacteria, mosses, and lichen. Biological soil crusts are commonly found in semiarid and arid environments throughout the world. Areas in the United States where crusts are a prominent feature of the landscape include the Great Basin, Colorado Plateau, Sonoran Desert, the inner Columbia Basin, and all over the state of New Mexico. Crusts are also found in agricultural areas, native prairies, and Alaska. Outside the United States, crusts have been studied in the Antarctic, Australia, and Israel, among other locations. In fact, microbiotic crusts have been found on all continents and in most habitats, leaving few areas crust-free.