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 Dunes National Park & Preserve (Colorado) At a place called Great Sand Dunes National Park & Preserve you can expect some serious sand sledding, and I doubt youâll be disappointed. Located about four hours from Denver, go to Great Sand Dunes for hiking, camping, and of course, sand sledding and sandboarding.