From oceanic depths and deep in the earth. With building pressure, it has to find release. Through small tunnels and narrow caverns. Giant pillars will reach out and touch the sky. What is it?

Riddle: From oceanic depths and deep in the earth. With building pressure, it has to find release. Through small tunnels and narrow caverns. Giant pillars will reach out and touch the sky. What is it?

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Geyser.