<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31351986</termId><termName>undersea mountain chains</termName><termType>PT</termType><termNote><![CDATA[ Mountain ranges located beneath of the surface of the ocean. ]]></termNote><termCreatedDate>2026-03-30 20:34:59</termCreatedDate><relation><relationType>UF</relationType><termId>31351987</termId><termName>chains, undersea mountain</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31351988</termId><termName>mountain chains, undersea</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31351989</termId><termName>undersea mountain chain</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31324173</termId><termName>undersea landforms</termName><termType>PT</termType></relation></term>  </Zthes>