earthquake

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See: cataclysm
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Considerable damage has been caused and many have been made victims because of seaquakes, tsunamis, fires and conflagration resulting from an earthquake; these produce a severe impact on a country or region's economic activity and social life [4].
She listed several elements known to cause such mortalities, including hypoxia, algal blooms, volcanism, earth- or seaquakes, vertical currents, severe storms, changes in temperature, and sudden changes in salinity.
Seaquakes, giant waves and the Bermuda Triangle effect have all surfaced as explanations for this strange event, but no one has ever solved the mystery.