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....
asthenosphere. n. 1. (Geological Science) a thin semifluid layer of the earth (100-200 km thick), below the outer rigid lithosphere, forming part of the mantle and thought to be able to flow vertically and horizontally, enabling sections of lithosphere to subside, rise, and undergo lateral movement.See also isostasy.he upper part of the Earth's mantle. The asthenosphere lies beneath the lithosphere and consists of several hundred miles of partially molten rock. Because it is partially molten, seismic waves passing through this layer have slow velocities.