Which of the following is not an impermeable material?

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Multiple Choice

Which of the following is not an impermeable material?

Explanation:
Permeability is about how easily fluids can move through a material. Sand has larger grains and connected pore spaces, so water can flow through it readily, making it permeable. Granite is a dense rock with low porosity, concrete is typically used as a barrier to water (though cracks can allow leakage), and clay’s very fine particles pack tightly, giving very low permeability. So sand is not an impermeable material, while the others are essentially impermeable under typical conditions.

Permeability is about how easily fluids can move through a material. Sand has larger grains and connected pore spaces, so water can flow through it readily, making it permeable. Granite is a dense rock with low porosity, concrete is typically used as a barrier to water (though cracks can allow leakage), and clay’s very fine particles pack tightly, giving very low permeability. So sand is not an impermeable material, while the others are essentially impermeable under typical conditions.

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