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.
1. One monster dust storm reached the Atlantic Ocean. While âblack blizzardsâ constantly menaced Plains states in the 1930s, a massive dust storm 2 miles high traveled 2,000 miles before hitting the East Coast on May 11, 1934.