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 mud-brick tombs were uncovered last week in the backyard of the Giza pyramids, stretching beyond a burial site first discovered in the 1990s and dating to the 4th Dynasty (2575 B.C. to 2467 B.C.), when the great pyramids were built on the fringes of present-day Cairo.