Man-made fibres are to be distinguished from natural fibres such as silk, cotton, and wool. Natural fibres also consist of polymers (in this case, biologically produced compounds such as cellulose and protein), but they emerge from the textile manufacturing process in a relatively unaltered state. Some man-made fibres, too, are derived from naturally occurring polymers.
Mount Si is located in North Bend, Washington (USA). The climb is 4,167 feet (1,270 meters) and 4 miles from the parking lot to the summit plateau. Vertical elevation change is about 3700 feet and starts at about 700 feet. The route meanders through several different ecosystems as temperatures and average rainfall vary with elevation.
Not to be confused with Bend, Oregon. North Bend is a city in Coos County, Oregon, United States with a population of 9,695 as of the 2010 census. North Bend is surrounded on three sides by Coos Bay, an S-shaped water inlet and estuary where the Coos River enters Coos Bay and borders the city of Coos Bay to the south. North Bend became an incorporated city in 1903.