The measure of how much water can be stored in geological materials is referred to as porosity. The correct option is C.
<h3>What are geological materials?</h3>
A geological material is a natural material extracted from the Earth in the form of rock or sediment, such as rocks, clays, sands, limestone, and other industrial minerals.
The percentage of void space in a rock is defined as porosity. It is defined as the ratio of the void or pore space volume to the total volume.
Thus, the correct option is C.
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