What’s the difference between permeability and porosity?

Porosity is a measure of how much of a rock is open space. This space can be between grains or within cracks or cavities of the rock. Permeability is a measure of the ease with which a fluid (water in this case) can move through a porous rock.

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40 minutes to complete the english test

Loss in amenity , biodiversity , which are most difficult to assess