Antarctica’s Mount Erebus is the most southerly active volcano in the world. Inside the ice caves the volcano’s warm, wet air freezes into frost crystals that grow into different shapes, depending on how the air currents flow. Here, an expedition member investigates the passages of Hut Cave. PHOTOGRAPH BY CARSTEN PETER, NATIONAL GEOGRAPHIC
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30 Natural Phenomena You Won’t Believe Actually Exist
Snow chimneys on Mount Erebus, Antarctica: the southernmost active volcano on Earth. | 30 Natural Phenomena You Won’t Believe Actually Exist
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Light filtering down inside the conical ice chimney of a Mount Erebus volcanic vent. Antarctica.
Glacier Cave A small "glacier cave" on the north polar ice cap offers a frigid refuge and and a wide sampling of exotic ice crystals. While many conventional caves are born from the actions of water and rock they form differently on Arctic's floating pack ice. Large glacier caves here grow where fissures are cut, and subsequently enlarged through the ice sheet, by the actions of seasonal meltwater or geothermal vents.