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
The sensation of weightlessness in a spacecraft in an orbit is due to the

Acceleration in the orbit which is equal to the acceleration due to gravity outside
Absence of gravity outside
Presence of gravity outside but not inside the spacecraft
Fact that spacecraft in the orbit has no energy

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