出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/07/26 20:19 UTC 版)
Nivation is a collective name for the different processes that occur under a snow patch. The primary processes are mass wasting and the freeze and thaw cycle, in which fallen snow gets compacted into firn or névé. The term glacier is applied only when ice has accumulated enough for the mass to achieve motion.