Define 
At what points is 
normal to the vector 
Definitions:
Permeability
An indicator of the ease with which fluids can flow through a material with pores or a rock.
Natural Cement
A type of material formed when certain natural rocks with hydraulic properties are finely ground and then mixed with water, initiating chemical reactions that result in a hardened substance.
Porosity
The measure of void spaces in a material, such as rock or soil, often expressed as a percentage of the total volume.
Natural Cement
Material formed when certain minerals dissolve in water and then precipitate, binding sediment grains together into a solid mass.
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