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	<title>moon rocks &#8211; Greg Laden&#039;s Blog</title>
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		<title>How old is the earth, and how do we know?</title>
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		<pubDate>Sat, 26 Feb 2011 18:32:54 +0000</pubDate>
				<category><![CDATA[Age of Earth]]></category>
		<category><![CDATA[Cosmos]]></category>
		<category><![CDATA[Dating]]></category>
		<category><![CDATA[Earth]]></category>
		<category><![CDATA[Earth Science]]></category>
		<category><![CDATA[Evolution]]></category>
		<category><![CDATA[moon rocks]]></category>
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					<description><![CDATA[How old is the earth? Short answer: 4,540,000,00/H30 Earth-years, plus or minus 1%. Long answer: We don&#8217;t know exactly because direct dating of the earliest material on the surface of the Earth will only tell use a minimum age; Prior to that, the Earth&#8217;s surface was probably molten, and even after that, it may be &#8230; <a href="https://gregladen.com/blog/2011/02/26/how-old-is-the-earth-and-how-d/" class="more-link">Continue reading <span class="screen-reader-text">How old is the earth, and how do we know?</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
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