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Spring tides occur when

  • A.the sun and moon are aligned, at new moon and at full moon
  • B.the sun and moon are at right angles as seen from the Earth
  • C.the moon is at its greatest distance from the Earth in orbit
  • D.the season is spring in the northern hemisphere of the Earth

Answer: A

Correct answer: the sun and moon are aligned, at new moon and at full moon

When the sun and moon lie on the same line as seen from Earth, their tide-raising forces reinforce and the range is at its greatest. That happens twice a lunar month, at new moon and at full moon, so spring tides come roughly every fortnight. The name has nothing to do with the season - it refers to the water springing up.

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