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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