Tsunamis are a) often generated by movements of the ocean floor b) waves that are produced by tidal forces c) waves that cannot cause damage on land d) also known as tidal waves

A) often generated by movements of the ocean floor

Explanation:

Tsunamis are also called as the giant waves which are caused by the movement of the ocean floor. The oceanic floor may move due to disturbances like earthquakes, underwater volcanic eruption, landslide and even the meteorite collision. These are also called as seismic sea waves but also mistakenly called as the tidal waves.

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