Chlorofluorocarbons or CFCs are a chemical compound containing carbon, chlorine, and fluorine. Throughout the 20th century, CFCs were mass produced for their popularity in refrigeration and spray cans. In the 1970s, evidence began to show the harmful effects of CFCs on Earth.
Originally created as Great Sand Dunes National Monument on March 17, 1932, Great Sand Dunes National Park and Preserve was established by an act of the United States Congress on September 13, 2004.
Great Sand Sea. The Great Sand Sea is the pure sandy part of the Western Desert. It is an enormous and in many ways uncharted area, which forms a natural barrier between Egypt and Libya. This monotonous yet fabulous and extremely beautiful area extends from the south of Siwa almost 700 km until it reaches the foot of the Gilf Kebir.