Aquifer (vectorized)
<p><a href="//commons.wikimedia.org/wiki/User:Biopics" title="User:Biopics">Hans Hillewaert</a>
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Derivative work: <a href="//commons.wikimedia.org/wiki/User:Irvan_Ary_Maulana" title="User:Irvan Ary Maulana">Irvan Ary Maulana</a>
<a href="//commons.wikimedia.org/wiki/File:Aquifer_en.svg" title="File:Aquifer en.svg">File:Aquifer en.svg</a>