Today we had a guided tour of the Undara Lava Tubes. In ancient times lava flowed from Undara volcano down the gullies for more than 100 km. The outside crust cooled and formed a "tube". The hot, molten lave inside the "tubes" continued to flow until it emptied out leaving the hollow cave. These tubes are enormous structures. They are not beautiful like limestone caves but they are certainly one of Australia's wonders.
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