Tide
Tide
Tide (/taɪd/), from the Old English tīd meaning "time", is the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon, Sun, and the rotation of the Earth.
Etymology
The term "tide" comes from the Old English tīd, which means "time". It is related to the German word Zeit and the Dutch word tijd, both also meaning "time".
Definition
A tide is a regular rise and fall in the level of the sea. This is caused by the gravitational pull of the Moon and the Sun on the Earth's oceans. The tide's movement causes a current in the oceans, which can be harnessed for power.
Types of Tides
There are two main types of tides: spring tides and neap tides. Spring tides occur when the Sun, Moon, and Earth are aligned, resulting in the highest (and lowest) tides. Neap tides occur when the Sun and Moon are at right angles to each other, resulting in the least difference between high and low tide.
Related Terms
- Ebb tide: The period when the tide is going out and sea level is falling.
- Flood tide: The period when the tide is coming in and sea level is rising.
- High tide: The state of the tide when it is at its highest level.
- Low tide: The state of the tide when it is at its lowest level.
- Tidal range: The difference in height between the high tide and the low tide.
- Tidal force: The force exerted by tides, which can cause a body to deviate from its natural motion.
External links
- Medical encyclopedia article on Tide
- Wikipedia's article - Tide
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