出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/04/09 01:10 UTC 版)
Fossil water or paleowater is groundwater that has remained sealed in an aquifer for a long period of time. Water can rest underground in "fossil aquifers" for thousands or even millions of years. When changes in the surrounding geology seal the aquifer off from further replenishing from precipitation, the water becomes trapped within, and is known as fossil water.