There is water on top of the ground and below the ground. Find out about that.
Some information for Advanced students:
http://www.windows.ucar.edu/tour/link=/earth/Water/groundwater.html&edu=high
Some information for Intermediate students:
http://www.windows.ucar.edu/tour/link=/earth/Water/groundwater.html&edu=mid
Some information for Beginners:
http://www.windows.ucar.edu/tour/link=/earth/Water/groundwater.html&edu=elem
http://www.windows.ucar.edu/tour/link=/earth/Water/images/groundwater_jpg_image.html
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