From Wikipedia, "The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity.".

Light fog hangs over Oil Creek, just south of Titusville in Oil Creek State Park.  The park is home to several waterfalls and over fifty miles of hiking trails, in addition to providing a historical perspective on the early petroleum industry.

Oil Creek

This photo was taken during a visit to Centralia, PA, on September 24, 2010.  The view is from one of the former streets of this former town, looking northeast towards the mountains.

To view information about Pennsylvania's wind farms, please visit:

A Line of Wind Turbines