70.Tides occur in the oceans and seas due to which among the following?
Gravitational force of the Sun
Gravitational force of the Moon
Centrifugal force of the Earth
Select the correct answer using the code given below:
a) 1 only b) 2 and 3 only c) 1 and 3 only d) 1, 2 and 3
The correct answer is 1, 2 and 3.
Tide
It is the periodical rise and fall of the sea level.
The Moon’s gravitational pull is the major cause of a tide.Hence statement 2 is correct.
Sun’s gravitational pull and centrifugal force due to the gravitational pull of the earth to a lesser extent so causes types. Hence statements 1 and 3 are correct.
Surges
The movement of water is caused by Meteorological effects like winds and atmospheric pressure changes and is known as surges.
The tide-generating force is the difference between the gravitational attraction of the Moon and the centrifugal force.
Tides vary in frequency, direction, and movement from place to place and from time to time.
Based on frequency, they are classified into semi-diurnal, diurnal, and mixed tide.
Springtide
When the sun, moon, and earth are in a straight line the height of the tide is higher and this occurs during a full moon period.
Neap tide
When the moon and the sun are at right angles to each other the forces of the sun and the moon tend to counteract each other. It occurs twice a month.
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