Which Pennsylvania town is famous for an underground coal fire that began in 1962?
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Pittsburgh
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Scranton
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Centralia
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Harrisburg
Which island is famous for its unusual umbrella-shaped dragon's blood trees?
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Mauritius
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Madagascar
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Réunion
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Socotra
Which natural gas fire burns continuously on a hillside in Azerbaijan?
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Mount Stromboli
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Yanar Dag
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Mount Etna
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Mount Vesuvius
Which Antarctic volcano is famous for having a persistent lava lake?
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Mount Melbourne
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Mount Sidley
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Mount Terror
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Mount Erebus
Which African lake contains enormous amounts of dissolved methane and carbon dioxide?
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Lake Chad
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Lake Malawi
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Lake Kivu
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Lake Turkana
Which Japanese island is famous for its many free-roaming cats?
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Tashirojima
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Hokkaido
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Miyajima
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Okinawa
Which giant circular geological formation in the Sahara is visible from space?
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Guelta d'Archei
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Great Rift Valley
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Great Blue Hole
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Richat Structure
Which fish creates intricate circular patterns in the seabed off Japan?
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Male white-spotted pufferfish
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Lionfish
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Clownfish
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Stonefish
Which Indonesian volcano has three crater lakes famous for changing colour?
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Mount Kelimutu
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Mount Merapi
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Mount Bromo
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Mount Rinjani
Which Mexican cave contains some of the world's largest natural selenite crystals?
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Reed Flute Cave
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Crystal Cave
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Naica Cave
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Mammoth Cave
