What are the causes of Tsunami ?

What are the causes of Tsunami ?
A tsunami is a large ocean wave that is caused by sudden motion on the ocean floor.

How a Tsunami Is Caused.The under water earthquakes and subduction zones are the most common cause.

How those reasons make Tsunami happen?

When an oceanic plate hits a continental plate the plates press together and pressure builds.
 

Eventually the heavier oceanic plate slips under the lighter continental plate and causes an earthquake.

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