[Answer] Where is the world's oldest continuous underground fire?

Step 1 : Introduction to the question "Where is the world's oldest continuous underground fire?"

...1. United States 2. China 3. Turkmenistan 4. Australia

Step 2 : Answer to the question "Where is the world's oldest continuous underground fire?"

Australia - A 6,000-year-old fire beneath the surface of Australia is the world’s oldest known underground fire that is still burning. Wingen Mountain, near the town of the same name in New South Wales, is now commonly known as Burning Mountain thanks to the coal-seam fire burning 70 feet underneath it. Underground coal fires are actually fairly common — there’s a famous one that’s been burning in the abandoned town of Centralia, Pennsylvania, since 1962. Once they start, they are nearly impossible to extinguish due to the insulation from surface elements. No one knows exactly what started the Burning Mountain fire — hypotheses include a forest fire, lightning strike, or even spontaneous combustion. The only sign of the fire is sulfurous smoke on the surface and parts of land that have caved in due to heat and toxic gases.:

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