
On a rainy day, water soaks into the soil. It splashes onto sidewalks and trickles down tiny cracks in the concrete. Where does it go? Deep beneath our feet We can't see Earth's groundwater, but just like the water on the surface, it's trickling, rushing and moving from one...

On a rainy day, water soaks into the soil. It splashes onto sidewalks and trickles down tiny cracks in the concrete. Where does it go? Deep beneath our feet We can't see Earth's groundwater, but just like the water on the surface, it's trickling, rushing and moving from one...