Answer:
They store water in the ground. ... The Water RE-Cycle Water from Earth's surface evaporates into the air, condenses into clouds, and falls back to Earth again as precipitation (such as rain). Water can easily pick up that pollutant and carry it down into the groundwater or through the watershed to a lake or a river.
When water enters the watershed as rain or snow, it is called precipitation. Trees and plants use much of the precipitation and then release it back into the air as water vapor. ... This continuous movement of water from the air to a watershed and back to the air is called the water cycle.