Ice Fumarole in Antarctica.

Photo: George Steinmetz

That is an ice tower (fumarole [wiki]), and Mount Erebus in Antarctica has hundreds of them:

The flanks of Erebus are spiked with ice towers, hundreds of them, called fumaroles. Gas and heat seeping through the side of the volcano melt the snowpack above, carving out a cave. Steam escaping from the cave freezes as soon as it hits the air, building chimneys as high as 60 feet.

Link - via jwz

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