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      <pubDate>2024-08-12 12:08:14 UTC</pubDate>
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         <title>2조 중간권</title>
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         <pubDate>2025-03-19 02:12:42 UTC</pubDate>
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         <title>1조 대류권</title>
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         <pubDate>2025-03-19 02:13:21 UTC</pubDate>
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         <title>4조 대류권</title>
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         <pubDate>2025-03-19 02:13:26 UTC</pubDate>
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         <title>5조 대류권</title>
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         <pubDate>2025-03-19 02:13:52 UTC</pubDate>
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         <title>3조 열권</title>
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         <pubDate>2025-03-19 02:14:03 UTC</pubDate>
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         <title>1조 대류권</title>
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         <pubDate>2025-03-19 02:14:26 UTC</pubDate>
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         <title>5조 대류권</title>
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         <link>https://padlet.com/sciencenineteacher/4/wish/3372272444</link>
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         <pubDate>2025-03-19 02:14:55 UTC</pubDate>
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         <title>1조 대류권</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372274048</link>
         <description><![CDATA[<p>대류권에 나타나는 구름의 사진</p>]]></description>
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         <pubDate>2025-03-19 02:15:50 UTC</pubDate>
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         <title>5조 대류권 30410 한상빈</title>
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         <description><![CDATA[<p>고도에 따른 온도변화는 다른 어떤 대기권보다도 심하다. 중간 위도의 경우 해수면의 온도가 +17°C인 데 반해 대류권계면에서는 -52 °C에 이른다. 대류권계면에서의 온도는 대류권이 얇은 극지방의 경우는 -45 °C정도인 데 반해, 대류권이 두터운 적도지방에서는 -75 °C에 이르기도 한다.</p>]]></description>
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         <pubDate>2025-03-19 02:15:57 UTC</pubDate>
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         <title>2조 중간권</title>
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         <pubDate>2025-03-19 02:16:16 UTC</pubDate>
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      <item>
         <title>2조 중간권</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372275307</link>
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         <pubDate>2025-03-19 02:16:34 UTC</pubDate>
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         <title>1조 대류권</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372275792</link>
         <description><![CDATA[]]></description>
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         <pubDate>2025-03-19 02:16:54 UTC</pubDate>
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      <item>
         <title>3조 열권</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372277126</link>
         <description><![CDATA[]]></description>
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         <pubDate>2025-03-19 02:17:43 UTC</pubDate>
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      <item>
         <title>6조 열권 </title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372278121</link>
         <description><![CDATA[<p><strong>대기 밀도</strong>: 열권은 대기 밀도가 매우 낮아, 그곳에 있는 공기는 매우 희박합니다. 그래서 우주 공간에 가까운 곳으로 간다고 볼 수 있습니다.</p>]]></description>
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         <pubDate>2025-03-19 02:18:20 UTC</pubDate>
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      <item>
         <title>6조 열권(오로라)</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372278174</link>
         <description><![CDATA[<p>오로라는 강한 태양풍 자기장으로 인해 극지방으로 끌려가 대기중 여러 입자와 충돌하여 빛현상을 말함.</p><p><br/></p><p>색깔이 제각각인데</p><p><br/></p><p>~ 100km : 초록색(산소)</p><p>100km ~ 300km : 빨강색(산소)</p><p>질소 : 파랑색 • 초록색 이다.</p><p><br/></p><p><br/></p>]]></description>
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         <pubDate>2025-03-19 02:18:21 UTC</pubDate>
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      <item>
         <title>4조 대류권</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372278855</link>
         <description><![CDATA[<p>대류권은 지구 대기의 가장 낮은 층으로, 지표에서 약 8~15km 높이까지 존재합니다. 대류권에서는 대부분의 기상 현상이 발생하며, 대기 중의 공기가 주로 수직 방향으로 순환하는 대류 운동이 일어납니다.</p><p>대류권의 특징은 다음과 같습니다:</p><ol><li><p><strong>기상 현상 발생</strong>: 구름, 비, 눈, 바람 등 대부분의 기상 현상이 대류권에서 발생합니다.</p></li><li><p><strong>온도 변화</strong>: 대류권에서는 고도가 높아질수록 기온이 낮아집니다. 일반적으로, 1km 올라갈 때마다 기온은 약 6.5도씩 낮아집니다.</p></li><li><p><strong>공기의 순환</strong>: 뜨거운 공기는 상승하고, 차가운 공기는 하강하면서 대류가 일어납니다. 이 대류 운동이 기상 변화의 주요 원인입니다.</p></li></ol><p>대류권은 대기의 가장 중요한 부분으로, 우리가 일상적으로 경험하는 날씨가 여기서 일어납니다.</p>]]></description>
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         <pubDate>2025-03-19 02:18:44 UTC</pubDate>
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      <item>
         <title>2조 중간권</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372279411</link>
         <description><![CDATA[]]></description>
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         <pubDate>2025-03-19 02:19:00 UTC</pubDate>
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      <item>
         <title>3조 열권</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372279416</link>
         <description><![CDATA[]]></description>
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         <pubDate>2025-03-19 02:19:00 UTC</pubDate>
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      <item>
         <title>5조 대류권</title>
         <author>2023yms145</author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372279727</link>
         <description><![CDATA[]]></description>
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         <pubDate>2025-03-19 02:19:12 UTC</pubDate>
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      <item>
         <title>3조 박슬찬</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372280203</link>
         <description><![CDATA[<p>"열권"은 대기권의 한 층을 의미하며, 지구 대기 중에서 약 80~500km의 고도에 위치해 있습니다. 열권은 대기권의 가장 위쪽에 위치하고 있으며, 이곳에서는 공기 밀도가 매우 낮고, 태양으로부터의 강한 자외선과 X선이 흡수되어 온도가 급격히 상승합니다.</p><p><br/></p><p>열권의 특징은 다음과 같습니다:</p><p><br/></p><p>1. **온도 상승**: 열권에서는 고도가 높아질수록 온도가 급격히 상승합니다. 이는 태양에서 오는 고에너지의 자외선, X선 등이 이곳의 분자들을 강하게 이온화시키기 때문입니다. 최고 기온은 2,500도 섭씨에 이를 수 있습니다.</p><p>  </p><p>2. **이온화**: 열권에서는 대기 중의 분자들이 태양의 방사선에 의해 이온화되어 전자와 양이온으로 나뉩니다. 이 이온화된 입자들이 전자기파를 반사하거나 굴절시키기 때문에, 이곳은 무선 통신에 영향을 미칠 수 있습니다.</p><p><br/></p><p>3. **오로라 발생**: 열권에서 태양풍과 대기 중의 입자들이 상호작용하면서 오로라 현상이 발생합니다. 특히, 북극과 남극에서 자주 나타납니다.</p><p><br/></p><p>4. **위성의 궤도**: 많은 인공위성들이 열권 바로 아래인 "저궤도"에 위치하며, 이곳에서 지구를 돌고 있습니다. 열권은 위성의 운동에 영향을 미칠 수 있습니다.</p><p><br/></p><p>열권은 매우 높은 고도에 위치한 영역으로, 일반적인 기상 현상은 이곳에서 발생하지 않지만, 우주 환경과 관련된 중요한 요소가 많이 존재하는 층입니다.</p>]]></description>
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         <pubDate>2025-03-19 02:19:26 UTC</pubDate>
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         <title>6조(열권)</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372281657</link>
         <description><![CDATA[<p>인공위성이 열권에 떠있는 이유</p><p><br/></p><p>1.대기밀도가 낮아 공기저항이 낮다</p><p>2.태양광선의 영향을 강하게 받아 우주에 대한실험을하는데 적합하다</p>]]></description>
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         <pubDate>2025-03-19 02:20:14 UTC</pubDate>
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         <title>4조 대류권</title>
         <author></author>
         <link>https://padlet.com/sciencenineteacher/4/wish/3372282363</link>
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         <pubDate>2025-03-19 02:20:35 UTC</pubDate>
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