What Are Porous and Non Porous Rocks?

Answer

A non porous rock is a rock that or which has interlocking grains so that water cannot get into it while a porous rock is like a sponge. Rocks with rounded grains are normally more crumbly and softer than rocks with interlocking grains.
Q&A Related to "What Are Porous and Non Porous Rocks"
These are rocks that are highly compacted, having little or no pore spaces within their grains. They do not readily allow the passage of water through them.
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( ′pör·əs ′ber·iŋ ) (design engineering) A bearing made from sintered metal powder impregnated with oil by a vacuum treatment.
http://www.answers.com/topic/porous-bearing
Pumice. Source(s) http://www.fi.edu/fellows/fellow1/oct98/….
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