<?xml version="1.0" encoding="utf-8"?><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcterms="http://purl.org/dc/terms/"><dc:title xml:lang="en">Archean</dc:title><dc:identifier>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31312572</dc:identifier><dc:language>en</dc:language><dc:publisher xml:lang="en">Getty Institute</dc:publisher><dcterms:created>2026-03-30 20:24:13</dcterms:created><dcterms:isPartOf xsi:type="dcterms:URI">http://AATesaurus.cultura.gencat.cat/aat/getty_en</dcterms:isPartOf><dcterms:isPartOf xml:lang="en">Tesaurus d&apos;Art i Arquitectura</dcterms:isPartOf><dc:format>text/html</dc:format> <dcterms:alternative xml:lang="en">Archaean</dcterms:alternative> <dcterms:alternative xml:lang="en">Archean Eon</dcterms:alternative> <dc:description xml:lang="en"><![CDATA[ On the geologic time scale, the period preceding the Proterozoic Eon, spanning about 1.5 billion years, in which the Earth's atmosphere was probably of methane, ammonia, and other gases, and the surface cooled enough that rocks and continental plates began to form. ]]></dc:description></metadata>