<Li> Fall line: A geomorphologic unconformity between an upland region of relatively hard crystalline basement rock and a coastal plain of softer sedimentary rock . </Li> <Li> Fallow: Agricultural land that is plowed or tilled but left unseeded during a growing season . Fallowing is usually done to conserve moisture . (IIP 2008) </Li> <Li> Fault: A fracture in the Earth's crust accompanied by a displacement of one side of the fracture . (IIP 2008) </Li> <Li> Fault - block mountain: A mountain mass created by either the uplift of land between faults or the subsidence of land outside the faults . (IIP 2008) </Li>

An area of flat land high above sea level with a steep side