<?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">pyroclastic rock</topic></authority><related type="narrower"><topic>trass</topic></related><related type="narrower"><topic>tuff</topic></related><related type="narrower"><topic>volcanic glass</topic></related><related type="broader"><topic>extrusive rock</topic></related><variant type="other"><topic>rock, pyroclastic</topic></variant><variant type="other"><topic>rocks, fragmental</topic></variant><variant type="other"><topic>rocks, pyroclastic</topic></variant><variant type="other"><topic>fragmental rock</topic></variant><variant type="other"><topic>fragmental rocks</topic></variant><variant type="other"><topic>pyroclastic rocks</topic></variant><variant type="other"><topic>rock, fragmental</topic></variant> <note xml:lang="en"><![CDATA[ Rock formed when dislocated and rupturing solid material is explosively or aerially ejected from a volcanic vent or rock formed when solid fragments are incorporated into moving lava. ]]></note></mads>