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Lava Tubes
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A lava tube is a natural tube formed by lava, which is being pushed out from a volcano. Some can even be hundreds of miles away from the volcano as they travel under ground. Convection currents inside the lava it self are making it all the same temperature no mater where you are. A lava tube does not have to have lava in it in order to be called a lava tube. In fact, some are millions of years old. Who knows, you might be walking on a trail and boom, a new discovery of a lava tube is found.