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 largest sand island in the world is Fraser Island, located of the coast of Queensland. It was formed during the ice age when great masses of sand were swept into the area by the wind. sand island is an island that is largely or completely made of sand. The largest sand island in the world is Fraser Island. Other examples of large sand islands are Moreton and North Stradbroke Islands which lie south of Fraser Island off the east coast of Australia.. http://en.wikipedia.org/wiki/Sand_island.