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.
What is a place where sand dunes are formed? Sand dunes can form in some areas of the desert, along the coast or near major bodies of water such as the Great Lakes. Some form in areas that were laid bare by the retre â¦ at of glaciers after the last ice age.