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3 de may. de 2024 · tide, any of the cyclic deformations of one astronomical body caused by the gravitational forces exerted by others. The most familiar are the periodic variations in sea level on Earth that correspond to changes in the relative positions of the Moon and the Sun.
Twice a month, when the Earth, Sun, and Moon line up, their gravitational power combines to make exceptionally high tides, called spring tides, as well as very low tides where the water has been displaced. When the Sun is at a right angle to the Moon, moderate tides, called neap tides, result.
5 de nov. de 2019 · In general, the gravitational pull of the moon and sun drives tides, forcing water to rise or fall over a period of time. Current is different, in that current moves water a specific direction, often with help from tide or wind. Check out these different types of tides and names of tides.
19 de oct. de 2023 · Vocabulary. The alternating advance and retreat of seawater along a coastline is called a tide. High tide is when water advances to its furthest extent onto the shoreline. Low tide is when it recedes to its furthest extent. Some freshwater rivers and lakes can have tides, too.
19 de oct. de 2023 · The moon’s ability to raise tides on the Earth is an example of a tidal force. The moon exerts a tidal force on the whole planet. This has little effect on Earth’s land surfaces, because they are less flexible. Land surfaces do move, however, up to 55 centimeters (22 inches) a day.
The most important examples of tidal forces on Earth are ocean tides, which result from the mutual attraction of the Moon and the Sun. Greek geographer Pytheas (c. 380 B.C. –c. 300 B.C. ) was perhaps the first careful observer of ocean tides.
Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon (and to a much lesser extent, the Sun) and are also caused by the Earth and Moon orbiting one another. Tide tables can be used for any given locale to find the predicted times and amplitude (or "tidal range").
