Think about what's beneath your feet. Once you've read this page, click here for the whats and whys of groundwater. On the next stop, you'll see that aquifers do not exist everywhere. If you plan to visit or move to a new place, maybe it's a good idea to know something about the water source you will rely on.
Click the Next button to go to the next stop.
The address (URL) of the current site is:
http://wwwga.usgs.gov/edu/earthgwaquifer.html