Which one of the following statements is correct about Spring tides ?
- A.High tide is higher than average high tide and Low tide is higher than average low tide.
- B.High tide is lower than average high tide and Low tide is higher than average low tide.
- C.High tide is higher than average high tide and Low tide is lower than average low tide.
- D.High tide is lower than average high tide and Low tide is lower than average low tide.
Correct answer
Explanation
The correct answer is C, High tide is higher than average high tide and Low tide is lower than average low tide. At spring tide the pulls of the Sun and the Moon add up, so the tidal range is at its greatest.
Spring tides occur twice a month, at new moon and full moon, when the Sun, the Moon and the Earth lie in a straight line, a position called syzygy. The combined pull piles more water into the high-tide bulges and draws it further away from the low-tide areas. Neap tides come about seven days later, at the first and last quarter, when the Sun and Moon pull at right angles and the tidal range is smallest.
A is wrong because a higher-than-average low tide does not happen at spring tide. B is wrong because a lower high tide with a higher low tide is the description of a neap tide. D is wrong because a high tide below average never goes with spring tides.
Exam tip: spring tide = new moon or full moon, maximum range; neap tide = quarter moon, minimum range.
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