| 31. | Tsunami are potentially dangerous waves triggered by seismic or volcanic activity.
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| 32. | The islands of the Comoros Archipelago were formed by volcanic activity.
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| 33. | In countries where volcanic ashes are available ( e . g.
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| 34. | The volcanic islands tend to be younger, the more westward.
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| 35. | Because of volcanic threat, the northern islands have been evacuated.
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| 36. | Geologically, these islands were formed by volcanic and seismic events.
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| 37. | Historically, so-called volcanic winters have caused catastrophic famines.
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| 38. | Volcanic eruptions may inject aerosols into the Earth's atmosphere.
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| 39. | The Yellowstone Caldera is the largest volcanic system in North America.
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| 40. | Most are volcanic and extrusive in nature, rather than tectonic.
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