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 Imperial Sand Dunes (known as Glamis) have been called many thingsâ¦ and they are all true! Glamis is the largest (40 miles in a band averaging 5 miles wide) off-highway vehicle (OHV) recreation area for sand dunes in the United States.