Thurston lava tube

Lava tubes form when the surface of a lava flow cools but underneath keeps on flowing because it’s hotter under there: over 1090 ºC (2000 ºF), in fact. Quite toasty indeed. When the volcano stops erupting, the lava drains away, leaving behind a tube.

Thurston lava tube is big enough to walk through.

Hawaii National Volcanoes Park, Hawaii (The Big Island)

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