Normally, there is a _________ day interval between spring tides and neap tides.

seven

The correct answer is Option (4) - seven

The relative positions of the Sun, Moon, and Earth influence the tides. Spring tides occur when the gravitational forces of the Sun and Moon align (new moon or full moon), leading to higher highs and lower lows. Conversely, neap tides happen when the Sun and Moon are at right angles to Earth (first and third quarter moons), causing less dramatic tidal variations. This cycle repeats roughly every seven days.