ergs
...that ergs are huge (> 125 km²) fields of sand dunes and that approximately 85% of all the Earth's mobile sand is found in ergs that are larger than 32,000 km²?
...that <b id="mwAuw"><a href="./Erg_(landform)" id="mwAu0" rel="mw:WikiLink" title="Erg (landform)">ergs</a></b> are huge (&gt; 125 km²) fields of <a class="mw-redirect" href="./Sand_dune" id="mwAu4" rel="mw:WikiLink" title="Sand dune">sand dunes</a> and that approximately 85% of all the Earth's mobile sand is found in ergs that are larger than 32,000 km²?