National Geographic : 1979 Nov
North America Four major deserts thread the continent. Snowmelt waters the high, cool Great Basin between the Rockies and Sierra Nevada. In L the Far West, the Mojave gets most of its rain in winter. In the Southwest, summer storms moisten the Chihuahuan. Sandwiched by the latter two, the Sonoran shares both summer and winter rainfall. %/ o. ing South America / One town in Chile's Atacama, the world's driest desert, has never recorded rain. A pair of deserts lace Argentina: the Patagonian in the south and the mineral-rich Monte farther north. Irrigated farmlands dot the narrow ae coastal Peruvian Desert. acad. ill Desert-making Wind Belts / At the Equator hot air rises, dumps rain as it cools and spreads toward the Poles. Between 15° and 30° north and south - the horse latitudes - the o air sinks and warms again, preventing the formation of clouds and rain and creating parallel belts of parched earth that girdle the globe.