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 great sandstone cliffs at Red Rock, thousands of feet high, are made up of the Aztec Sandstone. This formation, about 180 â 190 million years old, is comprised of lithified sand dunes that formed in a vast desert that covered a large part of the southwestern United States during the Jurassic time.