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Tsunamis occur when tech tonic plates under the oceans surface move and shift places causing a movement in the water and drawing all the water back, and then straight forward to the shore wiping out every thing in its path.
an earthquake under the ocean accurs and makes the plates under the ocean and causes massive waves to surrounds the following countries around where the earthquake took place.

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this was answered by a 13 year old.

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14y ago

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