Discussion
Spring tides, the tides of greatest range, occur when
Answer: C
Correct answer: The Sun, Earth and Moon are in a straight line
Spring tides occur when the Sun, Earth and Moon are aligned - at new moon and again at full moon - so that the tidal pulls of the Sun and Moon act along the same line and add together. High tides are then higher and low tides lower, giving the greatest range. When the Sun and Moon are at right angles, at the first and third quarters, their effects partly cancel and the range is least; these are neap tides. Each type recurs twice a lunar month, so the cycle alternates roughly every week. The name has nothing to do with the season. It comes from the sense of springing up, and spring tides occur every fortnight throughout the year. The Moon dominates because tidal force falls off with the cube of distance, so its nearness outweighs the Sun’s far greater mass; the Sun contributes about half as much.
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