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.
Europe. 1  The Dunes of Dyuni, near Pomorie, Bulgaria, vast area of sand dunes in the Burgas Province. 2  The Dune of Pilat, not far from Bordeaux, France, is the largest known sand dune in Europe. 3  The Dunes of Piscinas, in the south west of Sardinia island. 4  Sands of Forvie within the Ythan Estuary complex, Aberdeenshire, Scotland.