image tag: sulfur source, image quantity: 6

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sulfur source, iceland, highlands, highland island, hike
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iceland, volcano, volcanism, swell, hot, sulfur, geyser
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sulfur, rotorua, gases, toxic, volcanism, volcanic, new zealand
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mofetta, gázfeltörés, sour water, mineral water springs, sulfur source, spa, cave
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hverir, námaskarð, active volcanism, sulfur, gases, hot source, iceland
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morning glory hole, yellowstone national park, hotspring, hot source, national park, usa, hot