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 Tottori Sand Dunes (é³¥åç ä¸, Tottori sakyÅ«) are sand dunes located near the city of Tottori in Tottori Prefecture, Japan. They form the only large dune system (over 30 kmÂ²) in Japan.The dunes were created by sediment deposits carried from the ChÅ«goku Mountains by the Sendai River into the Sea of Japan. Sea currents and wind help bring the sand from the bottom up onto the shore, where the wind constantly rearranges their shape.The dunes have existed for over 100,000 years, but the area of the dunes has been steadily decreasing due to a government reforestation program following World War II.ea currents and wind help bring the sand from the bottom up onto the shore, where the wind constantly rearranges their shape. The dunes have existed for over 100,000 years, but the area of the dunes has been steadily decreasing due to a government reforestation program following World War II.