Lava tube
A lava tube, more rarely called a pyroduct or lava tunnel, is a natural roofed conduit along which molten lava flows from a volcanic vent. If lava in the tube drains out, it will leave an empty cave.
A lava tube, more rarely called a pyroduct or lava tunnel, is a natural roofed conduit along which molten lava flows from a volcanic vent. If lava in the tube drains out, it will leave an empty cave.
A lava tube, more rarely called a pyroduct or lava tunnel, is a natural roofed conduit along which molten lava flows from a volcanic vent. If lava in the tube drains out, it will leave an empty cave.
Source: Wikipedia "Lava tube" · CC BY-SA 4.0
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