<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">natural arches</topic></authority><related type="narrower"><topic>natural bridges</topic></related><related type="broader"><topic>landforms</topic></related><variant type="other"><topic>arches, natural</topic></variant><variant type="other"><topic>natural arch</topic></variant> <note xml:lang="en"><![CDATA[ Natural, stone structures that have holes through their centers formed by selective erosion. For similar natural structures that were formed by a current of water, use "natural bridges." Historically, usage of "natural bridges" and "natural arches" has overlapped.  ]]></note></mads>