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New page: An '''aquifer''' is an underground layer of rock and sand that contains water.<ref>USGS</ref> ==References== <references/> Category:Geology Category:Ecology
An '''aquifer''' is an underground layer of [[rock]] and [[sand]] that contains [[water]].<ref>USGS</ref>
==References==
<references/>
[[Category:Geology]]
[[Category:Ecology]]
==References==
<references/>
[[Category:Geology]]
[[Category:Ecology]]