Final answer:
Most rocks have pathways for water penetration due to their porosity and permeability. Sedimentary rocks tend to have high porosity and permeability, making them good aquifers.
Step-by-step explanation:
Most rocks have pathways for water penetration due to their porosity and permeability. Porosity refers to the open or void space within the rock, while permeability refers to the ability of the rock to transport fluids. Sedimentary rocks, such as sandstone and limestone, tend to have high porosity and permeability, making them good aquifers. In contrast, rocks with tight interlocking crystals, like igneous and metamorphic rocks, have low porosity and permeability.