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The summit cone of the Erebus volcano contains two craters. The Main crater is roughly circular (∼500 m diameter) and contains an active persistent phonolite lava lake ∼200 m below the summit rim. The Side Crater is adjacent to the southwestern rim of the Main Crater. It is a smaller spoon-shaped Crater (250–350 m diameter, 50–100 m deep) and is inactive. The floor of the Side Crater is covered by...
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