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.
Sand dunes are found around the world, in varying types of climates. Overall, every sand dune is created by the interaction of the wind with soil in the form of grains of sand. Lush Dunes and Rugged Mountains Exist on Saturn's Largest Moon Saturn's moon Titan has dunes â lots of them.