A tsunami is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake.
An earthquake is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves.
A flood is an overflow of water that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide.
