There are six commonwealth-owned parks in Bucks County: 1  Five are owned and operated by the Pennsylvania Bureau of State Parks, part of the Pennsylvania Department of Conservation and Natural Resources (DCNR). 2  Bucks County Parks and Recreation operates an 18-bed youth hostel in the Nockamixon State Park Weisel estate.
lithosphere definition: Lithosphere is defined as the rock and crust surface that covers the Earth. (noun) An example of lithosphere is the Rocky Mountain range in western North America....
The lithosphere is composed of the crust and upper mantle of the Earth that behave as elastic brittle solids under stress. The lithosphere extends from the Earth's surface to â¦a depth of between 100 to 200 km.