Aquifer (vectorized)
<a href="//commons.wikimedia.org/wiki/User:Biopics" title="User:Biopics">Hans Hillewaert</a>
<a href="https://en.wikipedia.org/wiki/Image:Schematic_aquifer_xsection_usgs_cir1186.png" class="extiw" title="en:Image:Schematic aquifer xsection usgs cir1186.png">en:Image:Schematic aquifer xsection usgs cir1186.png</a>