The rest is so-called " fossil water, " locked in glaciers and the permanent ice shield that covers the far north.
12.
Virtually all of the water at Ash Meadows is fossil water, believed to have entered the ground water system tens of thousands of years ago.
13.
The Garamantes achieved this development by digging tunnels far into the mountains flanking the valley to tap fossil water and bring it to their fields.
14.
Similar, but different in origin, is the concept of fossil water which is used to describe very old groundwater found in deep aquifers or bedrock.
15.
Directly or indirectly, almost all of the Ash Meadows endemics rely on fossil water stored in underground basins since the end of the last Ice Age.
16.
Nonrenewable Fossil water is mined from depths as great as 1 km ( 3, 000 ft ), pumped to the surface, and distributed via large centre pivot irrigation feeds.
17.
Water resources, such as lakes and aquifers, are usually renewable resources which naturally recharge ( the term fossil water is sometimes used to describe aquifers which don't recharge ).
18.
The shallow springs are fed with fossil water so clear that it reflects the blue of the sky and the green of the algae on which the small fish feed.
19.
Aquifer drawdown or overdrafting and the pumping of fossil water increases the total amount of water in the hydrosphere, and has been postulated to be a contributor to sea-level rise.
20.
Sometimes it is useful to make a distinction between groundwater that is closely associated with surface water and deep groundwater in an aquifer ( sometimes called " fossil water " ).
