Consider how “porosity” and “permeability” affect how well an underground rock u

Question

Consider how “porosity” and “permeability” affect how well an underground rock unit can store and transmit groundwater. A. What is the difference between porosity and permeability?

B. Why do igneous and metamorphic rocks typically display low porosity, but yet sometimes produce the properties suitable for the flow of groundwater?

C. Consider the “do-it-yourself porosity demonstration” described on p. 319 and in Figure 12.6 of your textbook. If 200 mL of water were left in the beaker after saturating the sand in the other beaker, what is the porosity of the sand?

Explanation / Answer

Answer : A

Difference between porosity and permeabilty.

Porosity : Porosity is defined as the volume of voids in a rock mass expressed in percent terms of the total volume of the rocks.

Permeability : It is the capacity of rocks to transmit fluids through it.

Answer : B

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