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.
The Wave-Like Dunes of White Sands. It's impossible not to be struck by the starkness and grandeur of White Sands National Monument. Wave-like dunes of pure white gypsum sand engulf 275 square miles of New Mexicoâs Tularosa Basin, creating one of the worldâs most impressive natural wonders. White Sands was established as a national monument in 1933, but its history goes back much further.