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<p><a href="page.php?w=Dry_ice">solid carbon dioxide</a> and water ice.</p>

<p>Polar ice caps form because high-latitude regions receive less energy in the form of <a href="page.php?w=solar_radiation">solar radiation</a> from the Sun than <a href="page.php?w=equator">equator</a>ial regions, resulting in lower surface temperatures.</p>

<p>Earth's polar caps have changed dramatically over the last 12,000 years. <a href="page.php?w=Season">Season</a>al variations of the ice caps takes place due to varied solar energy absorption as the planet or moon</p><p>
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