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  1. Spring tides occur when the sun and moon are at right angles to each other with earth as centre
  2. There is a seven day interval between the spring tides and neap tides
  3. Neap tides occur when the sun, the moon and the earth are in a straight line
  4. Spring tides occurs only once a month on the full moon period
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1 Answers

Option 2 : There is a seven day interval between the spring tides and neap tides

The correct answer is option 2, i.e There is a seven day interval between the spring tides and neap tides.

  • Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun, and the rotation of the Earth.
  • There are two types of tides namely, spring tides and neap tides depending upon the relative positions of the sun, the earth and the moon.
  • Spring tides:
    • When the sun, the moon and the earth are in a straight line, the height of the tide will be higher. Hence, Option 1 is NOT correct.
    • These are called spring tides and they occur twice a month, one on full moon period and another during new moon period. Hence, Option 4 is NOT correct.
  • Neap tides:
    • Normally, there is a seven day interval between the spring tides and neap tides. Hence, Option 2 is correct.
    • At this time the sun and moon are at right angles to each other and the forces of the sun and moon tend to counteract one another. Hence, Option 3 is NOT correct.
    • The Moon’s attraction, though more than twice as strong as the sun’s, is diminished by the counteracting force of the sun’s gravitational pull.
    • Like spring tides, these tides also occur twice a month.
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