(gÉrÄ­l`É) [Span.,=little war], fighting by groups of irregular troops (guerrillas) within areas occupied by the enemy. When guerrillas obey the laws of conventional warfare they are entitled, if captured, to be treated as ordinary prisoners of war; however, they are often executed by their captors.
The Inside Story â Concrete Is Porous. Most people do not realize that concrete is porous â more porous than Swiss cheese! The pores constitute 12 â 18% or more of the concrete but they are invisible, much smaller than the diameter of human hair. After new concrete is poured, almost half of the water has to evaporate.
It doesnât have the same hardness in the feel that some people find unpleasant. Like other hard surface countertop materials, quartz is non-porous so it resists staining much better than granite, marble and concrete. It stands up to juice, oil, wine, tomato, coffee and other sources of stains in the kitchen. For cleanliness, a non-porous surface means that it will not harbor bacteria or viruses.