Neap tide

Definition

A neap tide is a type of tide that occurs when the difference between high and low tide is least. This happens twice a month when the Sun and Moon are at right angles to each other.

5 Must Know Facts For Your Next Test

1. Neap tides occur during the first and third quarters of the Moon's phases.
2. The gravitational forces of the Sun and Moon partially cancel each other out during a neap tide, resulting in lower high tides and higher low tides than average.
3. Neap tides are less extreme compared to spring tides, where the tidal range is at its maximum.
4. The term 'neap' comes from an Old English word meaning 'without power' because these tides are weaker than normal.
5. Understanding neap tides is crucial for predicting tidal patterns, which affect coastal navigation and marine activities.

Review Questions

• What phase of the Moon corresponds with neap tides?
• How do the gravitational forces of the Sun and Moon interact during a neap tide?
• Why are neap tides less extreme than spring tides?

Related terms

Spring Tide: A type of tide that occurs when the difference between high and low tide is greatest, usually during full or new moons.

Tidal Forces: Gravitational forces exerted by celestial bodies that cause periodic variations in sea levels.

Quarter Moon: $$\text{One-half illuminated moon}$$ appearing either as first quarter (half waxing) or third quarter (half waning).