Precipitation soaks into the ground and becomes ground water.
Surface water filters through soil and rock before reaching an aquifer.
Water in the spaces/openings surrounding soil particles (interstitial) is used for the biological needs of many plants and animals.
Aquifers are impounded or enclosed areas which hold the water underground.
Many aquifers are tapped by communities for drinking water.
Surface waters that become contaminated or polluted may seep into underground aquifers, deteriorating the quality of the water in the watershed.