| 21. | Astronomers hope to observe a volcanic eruption on Io on Saturday.
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| 22. | Montserrat suffered its third volcanic eruption in three weeks on Friday.
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| 23. | Scalding volcanic debris prevented rescuers from getting near victims using boats.
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| 24. | The volcanic islet has been in dispute for nearly a century.
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| 25. | The bacteria live on hydrogen sulfide gas associated with volcanic activity.
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| 26. | Both sides claim the volcanic outcroppings surrounded by rich fishing grounds.
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| 27. | Tsunamis are the undersea waves triggered by volcanic activity or earthquakes.
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| 28. | The plug was originally thought to contain mostly crumbly volcanic material.
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| 29. | It was not clear if it was experiencing any volcanic activity.
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| 30. | Advances also have come in the third set, volcanic gases.
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