Earthquakes are caused by Earth's Tectonic movements..
Volcano is caused by the movement of molten lava inside Earth..
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Convection currents.
Earthquakes or the volcano itself
Plate tectonics
Things falling on people.
Hurricanes do not form underwater, as they require warm ocean water. Earthquakes can certainly occur underwater, known as underwater earthquakes, and can trigger tsunamis due to the displacement of water.