Clean water is abundant due to the mountainous terrain with its impermeable rock.
2.
However, by far most of geothermal energy within reach of conventional techniques is in dry and impermeable rock.
3.
Because of the transition from water-permeable to impermeable rock layers several spring horizons have emerged, explaining the richness of the springs.
4.
To begin with, the vertical depth separation between drinking water aquifers and reservoir targets for gas production is several thousand feet of impermeable rock.
5.
The pools _ pockets of water that form atop impermeable rock after rain showers _ also serve as temporary habitat to countless migratory birds.
6.
The field has remained undeveloped because the oil is trapped in impermeable rock, requiring advanced technology and very large numbers of oil wells to extract it.
7.
The anticline is composed of a series of sandstone rock beds and an impermeable rock cap under which vast reserves of oil and gas are trapped.
8.
This water, unlike surface water, must have come from deep-crust minerals and had been unable to reach the surface because of a layer of impermeable rock.
9.
It is water-rich, because the ground contains copious impermeable rocks, particularly sandstone and conglomerate at lower elevations, whereas at higher elevations, it mainly consists of limestone and dolomite.
10.
Oil is found in several steeply dipping sand units bounded by impermeable rocks; the sands pinch out towards the ground surface, and oil accumulates in the upper portions.
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