See 26InchSlicks: Crossing Washington State on the John Wayne Pioneer Trail. 10 longest. Of the longest trails compiled by the Rails to Trails Conservancy, here are the 10 longest that are accessible to bicycles: Cyclists ride along the nearly dry Keechelus lake bed in the fall.
Parent material. Parent material is the underlying geological material (generally bedrock or a superficial or drift deposit) in which soil horizons form.
noun. 1  1mass noun The hard fibrous material that forms the main substance of the trunk or branches of a tree or shrub, used for fuel or timber. âa block of woodâ. 2  2An area of land, smaller than a forest, that is covered with growing trees. âa thick hedge divided the wood from the fieldâ.