rat spill n. the accidental importation of rats to a rat-free island (or, rarely, to any rat-free piece of land). (posted Jan. 4, 2005) [full entry…]
schmutzdecke n. a naturally occurring gelatinous layer of living biological matter on a sand-based water filter, for which it provides additional filtration. (posted Mar. 16, 2007) [full entry…]
sky island n. an isolated ecosystem occurring at a high altitude, such as on a mountain top, which shows evolutionary tendencies similar to those occurring on islands surrounded by water. (posted Aug. 29, 2006) [full entry…]
socks and knocks n.pl. the oxides of sulfur and nitrogen commonly found in pollution. (posted Apr. 22, 2005) [full entry…]
swampbuster n. a person who converts swampland into farmland. (posted Jun. 28, 2007) [full entry…]
viewshed n. the landscape or topography visible from a geographic point, especially that having aesthetic value. (posted Mar. 27, 2006) [full entry…]