To be useful as a source of water,a rock must be

Question

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A rock that is both porous and permeable allows water to flow through it easily while also being able to hold a significant amount of water. This makes it ideal as a source of water. A rock that is only porous but not permeable would not allow water to flow through it easily, while a rock that is only permeable but not porous would not be able to hold enough water. A rock with low porosity and permeability would not be a suitable source of water at all.

To Be Useful as a Source of Water,a Rock Must