Discussion
Assertion (A) : Tides are the periodic rise and fall of the ocean resulting from gravitational interactions of the moon, sun and the Earth.
Reason (R) : The rotation of the Earth, size and geometry of the ocean basins and local climatic conditions determine the local magnitude and periodicity of tides.
Which of the following is correct ?
Answer: B
Both statements are true but the Reason does not explain the Assertion.
The Assertion is the definition of tides: the periodic rise and fall of the sea caused by the gravitational pull of the Moon and the Sun on a rotating Earth.
The Reason is also true: the actual tide at a place, its range and whether it is semi-diurnal, diurnal or mixed, depends on the Earth's rotation, the shape and size of the ocean basin and coast, and local conditions. But these factors modify the local tide; they do not explain why tides occur, which is the gravitational interaction the Assertion already states. So the answer is not the first option, and neither statement is false.
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