Q.

The tides in the sea are primarily due to –

A. the atmospheric effect of the Earth
B. the gravitational effect of Venus on the Earth
C. the gravitational effect of the Sun on the Earth
D. the gravitational effect of the Moon on the Earth
Answer» D. the gravitational effect of the Moon on the Earth
Explanation: A tide is the periodic rising and falling of Earth's ocean surface caused mainly by the gravitational pull of the Moon acting on the oceans. The height of tides varies somewhat with the phases of the Moon. At New Moon and Full Moon, tides are higher because the Sun's tidal force adds to the Moon's. This is called "spring tide".
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