Acacia tree in Makhtesh Gadol, Negev Desert, Israel
<a href="//commons.wikimedia.org/wiki/User:Wilson44691" title="User:Wilson44691">Wilson44691</a>
self-made; Mark A. Wilson<a rel="nofollow" class="external autonumber" href="http://www3.wooster.edu/geology/MWilson.html">[1]</a>