Physics
The tidal waves on sea is mainly due to

None of these
Gravitational Effect of Sun on Earth
Gravitational Effect of Moon on Earth
Gravitational Effect of Earth on Moon

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Physics
The term ''equinox' means

The path which the Earthtakes around the Sun
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
When the day and night are of equal duration
The axis of the Earth around which it rotates

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