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	<id>https://keystagewiki.com/index.php?action=history&amp;feed=atom&amp;title=Echo</id>
	<title>Echo - Revision history</title>
	<link rel="self" type="application/atom+xml" href="https://keystagewiki.com/index.php?action=history&amp;feed=atom&amp;title=Echo"/>
	<link rel="alternate" type="text/html" href="https://keystagewiki.com/index.php?title=Echo&amp;action=history"/>
	<updated>2026-05-08T02:01:12Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
	<generator>MediaWiki 1.32.1</generator>
	<entry>
		<id>https://keystagewiki.com/index.php?title=Echo&amp;diff=14235&amp;oldid=prev</id>
		<title>NRJC at 21:32, 7 April 2019</title>
		<link rel="alternate" type="text/html" href="https://keystagewiki.com/index.php?title=Echo&amp;diff=14235&amp;oldid=prev"/>
		<updated>2019-04-07T21:32:10Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
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				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #222; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #222; text-align: center;&quot;&gt;Revision as of 21:32, 7 April 2019&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l5&quot; &gt;Line 5:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 5:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;===About Echos===&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;===About Echos===&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;: An [[echo]] happens when [[sound]] in a [[gas]] or a [[liquid]] meets the boundary with a [[solid]].&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;: An [[echo]] happens when [[sound]] in a [[gas]] or a [[liquid]] meets the boundary with a [[solid]].&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;: Some [[animal]]s like &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;[[bat]]s &lt;/del&gt;and &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;[[dolphin]]s &lt;/del&gt;use [[echo]] location to find their [[prey]] by making a [[sound]] and listening for the [[echo]].&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;: Some [[animal]]s like &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;bats &lt;/ins&gt;and &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;dolphins &lt;/ins&gt;use [[echo]] location to find their [[prey]] by making a [[sound]] and listening for the [[echo]].&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>NRJC</name></author>
		
	</entry>
	<entry>
		<id>https://keystagewiki.com/index.php?title=Echo&amp;diff=5230&amp;oldid=prev</id>
		<title>NRJC at 16:00, 20 October 2018</title>
		<link rel="alternate" type="text/html" href="https://keystagewiki.com/index.php?title=Echo&amp;diff=5230&amp;oldid=prev"/>
		<updated>2018-10-20T16:00:44Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
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				&lt;col class=&quot;diff-marker&quot; /&gt;
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				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #222; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #222; text-align: center;&quot;&gt;Revision as of 16:00, 20 October 2018&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l4&quot; &gt;Line 4:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 4:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;===About Echos===&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;===About Echos===&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;: An [[echo]] happens when [[sound]] in &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;the &lt;/del&gt;[[&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;air&lt;/del&gt;]] meets the boundary with a [[solid]].&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;: An [[echo]] happens when [[sound]] in &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;a [[gas]] or a &lt;/ins&gt;[[&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;liquid&lt;/ins&gt;]] meets the boundary with a [[solid&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;]].&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt; &lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;: Some [[animal]]s like [[bat]]s and [[dolphin]]s use [[echo]] location to find their [[prey]] by making a [[sound]] and listening for the [[echo&lt;/ins&gt;]].&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>NRJC</name></author>
		
	</entry>
	<entry>
		<id>https://keystagewiki.com/index.php?title=Echo&amp;diff=5229&amp;oldid=prev</id>
		<title>NRJC: Created page with &quot;==Key Stage 3== ===Meaning=== An echo is a reflection of sound.  ===About Echos=== : An echo happens when sound in the air meets the boundary with a ...&quot;</title>
		<link rel="alternate" type="text/html" href="https://keystagewiki.com/index.php?title=Echo&amp;diff=5229&amp;oldid=prev"/>
		<updated>2018-10-20T15:58:34Z</updated>

		<summary type="html">&lt;p&gt;Created page with &amp;quot;==Key Stage 3== ===Meaning=== An &lt;a href=&quot;/index.php/Echo&quot; title=&quot;Echo&quot;&gt;echo&lt;/a&gt; is a &lt;a href=&quot;/index.php/Reflection&quot; title=&quot;Reflection&quot;&gt;reflection&lt;/a&gt; of &lt;a href=&quot;/index.php/Sound&quot; title=&quot;Sound&quot;&gt;sound&lt;/a&gt;.  ===About Echos=== : An &lt;a href=&quot;/index.php/Echo&quot; title=&quot;Echo&quot;&gt;echo&lt;/a&gt; happens when &lt;a href=&quot;/index.php/Sound&quot; title=&quot;Sound&quot;&gt;sound&lt;/a&gt; in the &lt;a href=&quot;/index.php/Air&quot; title=&quot;Air&quot;&gt;air&lt;/a&gt; meets the boundary with a ...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;==Key Stage 3==&lt;br /&gt;
===Meaning===&lt;br /&gt;
An [[echo]] is a [[reflection]] of [[sound]].&lt;br /&gt;
&lt;br /&gt;
===About Echos===&lt;br /&gt;
: An [[echo]] happens when [[sound]] in the [[air]] meets the boundary with a [[solid]].&lt;/div&gt;</summary>
		<author><name>NRJC</name></author>
		
	</entry>
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