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A lava tube is a natural conduit formed by flowing lava which moves beneath the hardened surface of a lava flow. Tubes can be actively draining lava from a volcano during an eruption, or can be extinct, meaning the lava flow has ceased, the rock has cooled, and a cave-like channel remains. This lava tube - called the Lava Arch - is one of the shortest lava tubes in the Cascade Range.

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