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<p>Precipitation occurs when the methane comes in contact with water within the sea bed subject to temperature and pressure. In 2008, research on Antarctic <a href="page.php?w=Vostok_Station">Vostok Station</a> and <a href="page.php?w=European_Project_for_Ice_Coring_in_Antarctica">EPICA Dome C</a> ice cores revealed that methane clathrates were also present in deep <a href="page.php?w=Antarctica">Antarctic</a> <a href="page.php?w=ice_core">ice core</a>s and record a history of <a href="page.php?w=atmospheric_methane">atmospheric methane</a> concentrations,</p><p>
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