The moon has the strongest effect on the rise or fall of the tides due to its gravitation pull. The normal tides are always present in the ocean at different hours of a day. But in spring tides, the moon has its full phase, it has the strongest effect on the tides as high tides convert to highest tides and low tides to the lowest tide. In the neap tide, the low tide converts to lowest high tide and high tide converts to a highest low tide which makes the extreme difference between high and low tide.
