As with other forms of electromagnetic radiation, X-rays can be described as coupled waves of electric and magnetic fields traveling at the speed of light (about 300,000 km, or 186,000 miles, per second).
Lock Haven, Pennsylvania. The city of Lock Haven is the county seat of Clinton County, in the U.S. state of Pennsylvania. Located near the confluence of the West Branch Susquehanna River and Bald Eagle Creek, it is the principal city of the Lock Haven Micropolitan Statistical Area, itself part of the WilliamsportâLock Haven combined statistical area.
Keystone State Park is a 1,200-acre (486 ha) Pennsylvania state park in Derry Township, Westmoreland County, Pennsylvania in the United States. The main attraction of the park, which opened in 1945, is the 78-acre (32 ha) Keystone Lake, constructed by the Keystone Coal and Coke Company in the early 1900s. The park also has extensive picnic areas and several miles of hiking trails.