Physics
The cause for the Tsunami, as deduced by the seismologists, is

Sudden change in the monsoon wind
Low pressure trough in the ocean
Deformation of sea floor and vertical displacement of water
Gravitational pull of the moon

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Physics
Stationary wave is formed by

Two waves of the same speed superposing
Two waves of same frequency travelling in the opposite direction
Two waves of same frequency travelling in the same direction
A transverse wave superposing a longitudinal wave

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