Final answer:
Aquifers are bodies of rock or sediment that store large amounts of usable water in their pores. They both hold water and allow it to pass through.
Step-by-step explanation:
Aquifers are bodies of rock or sediment that store large amounts of usable water in their pores. They are typically made up of permeable rocks, such as sandstone and limestone, which allow water to flow through them. Aquifers both hold water and allow it to pass through, making them an important source of drinking and irrigation water.