1.   The process will be particularly useful in areas of porous rock, where silage pollutants can travel many miles before entering the river system.

2.   Also, pumping so much water into porous rock confined between impermeable layers could, in theory, crack the ceiling or floor, some geologists have said.

3.   In times of surplus, water would be pumped into this layer of porous rock, then pumped out when supplies are low, city officials said.

4.   So does helium in porous surface rocks, which tends to dissipate fairly quickly.

5.   The method is based on the existence of the boulder zone, a layer of porous rock at the lower depths of the Floridan Aquifer.

6.   The Turkish-speaking herders who live in the damp dwellings dug into the steep, strangely shaped cones of porous volcanic rock do not talk much about politics.

7.   As sandstone bakes in the sun, the water evaporates and leaves behind salt crystals in the porous rock.

8.   Fibrous zeolite is a mineral fiber found in volcanic tuff, a porous rock formed from volcanic ash.

9.   It would be micro-organisms that retreated into porous rocks themselves.

10.   They evidently were impressed by the eery-looking islands with their moonscapes of porous volcanic rock, jagged cliff formations and lava fields.