Answer: Most tsunamis are caused by large earthquakes below or near the ocean floor, but tsunamis can also be caused by landslides, volcanic activity, certain types of weather and near earth objects (e.g., asteroids, comets). Not all earthquakes cause tsunamis.
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D. Caldera
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Caldera
(noun)
a large volcanic crater, especially one formed by major eruption leading to the collapse of the mouth of the volcano.
Your answer would be as said above *Caldera*
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the Eurasian, Philippine and North American.
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they needed an acurate calender to tell the date
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new York city of uunite states of america