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Science students are typically amazed to find out that rocks absorb water. In reality, the amount of water rocks absorb is based on the porosity of the rock. Porosity of rocks is based on the number of holes, pores, or cracks within and on rocks. Some pores are on the surface of rocks and are microscopic; however, many pores are small and sometimes large enough to be visible without the aid of a magnifying glass. All rocks are porous to some extent including granite, marble, sandstone, and limestone.
Students conduct an experiment to determine the ability of rocks to absorb and retain water, making connections with the concepts of porosity and permeability in rocks.