Tides

A:

An ebb tide occurs when a tidal current moves away from land. Tidal currents moving toward land are called floods. Ebbs and floods are categorized as reversing currents.

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  • How often do tides occur?

    Q: How often do tides occur?

    A: Ocean tides are caused by the gravitational pull of the Moon and Sun. Due to the rotation of the Earth, locations will experience two high and two low tides each day. An alignment of the Sun and Moon will result in more extreme tides, known as spring tides.
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  • How are sea waves formed?

    Q: How are sea waves formed?

    A: Many factors impact the generation, severity, frequency and strength of ocean waves. One of the most important factors leading to the formation of an ocean wave is the wind. The shapes of the basins of the ocean dictate the ocean's regular movements and also affect waves.
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  • How long does high tide last?

    Q: How long does high tide last?

    A: High tides are part of a cycle of rising or receding water that lasts for approximately 6 hours and 13 minutes. Low tides last for the same amount of time.
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  • What are lunar tides?

    Q: What are lunar tides?

    A: According to Science and the Sea, lunar tides are the most common tides and are caused by the Moon's gravity. Although the Sun's gravity is stronger, it is farther from the Earth than the Moon, which is why lunar tides are more than two times stronger than solar tides.
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  • Q: Why are there tides?

    A: Tides form when the gravitational forces of the moon and sun act on the Earth as it spins around its axis. Tides are the rise and fall of the sea level in reference to land. For example, spring tides are the result of the alignment of the sun, moon and Earth that typically occurs during new and full moons.
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  • Q: Where can you find information about local tides?

    A: Find information about tides at Tides4Fishing.com or TidesAndCurrents.NOAA.gov. Tides4Fishing.com features tide tables and related data for the U.S. East, West and Gulf Coasts, and Hawaii and Alaska. TidesAndCurrents.NOAA.gov features tide tables and related data for these locations and for other U.S. territories, and for many Pacific and Caribbean islands.
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  • Q: Why do tides occur?

    A: Tides are caused by a combination of three factors: the moon's gravity, the sun's gravity and the earth's own gravity. The moon's gravity is the most significant of these forces; it exerts 2.2 times more force on the tides than the sun's gravity does.
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  • How does a tidal barrage work?

    Q: How does a tidal barrage work?

    A: Electricity is generated through the revolution of turbines installed in a dam built across a river. Turbines are designed to work for both the ebb and the flow directions. These turbines move due to tidal movements.
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  • Q: What can you learn from tide tables?

    A: Tide tables can tell you when the water level will be at its highest and lowest at a particular location. Tide tables can also be used to predict the height of water at times between high and low tide.
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  • What is the most common tidal pattern around the world?

    Q: What is the most common tidal pattern around the world?

    A: The most common tide pattern around the world is that of semi-diurnal tides. This pattern contains two high tides and two low tides of the same height occurring in a 24-hour period. Semi-diurnal tides occur when the moon is over the equator.
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  • When is the daily tidal range the greatest?

    Q: When is the daily tidal range the greatest?

    A: The daily tidal range is greatest at the new moon and full moon, when the tidal pulls of the moon and sun are in phase with each other. This phenomenon is called a spring tide and is strongest when it coincides with the vernal or autumnal equinox.
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  • Q: How do waves work?

    A: When the sun heats the air, it causes the air to become lighter and float upwards. When hot air floats upwards, cooler air rushes in to take its place. The rush of the cool air against the water creates ripples, which eventually turn into waves.
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  • Q: How often do spring tides occur?

    A: Spring tides occur twice a month during the full and new moons. Spring tides are the result of the alignment of the Sun, Moon and Earth and the effects of their gravitational forces. Spring tides are also high tides.
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  • Q: What causes waves?

    A: Waves are caused by wind blowing on the ocean surface. Stronger winds cause larger waves. Variations in wind speed and duration determine the size and frequency of waves. The horizontal length of the wave is established by the horizontal distance between its two crests and the vertical length is established by the vertical distance between the crests. Large waves can also be created by undersea seismic activity.
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  • Q: What is a spring tide?

    A: A spring tide is the tide which occurs at the time of full moon and new moon. The difference between the highest and the lowest rise of tides is highly pronounced during spring tide, and hence it can be easily distinguished.
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  • Q: What causes tides?

    A: Tides, which are rising and falling sea levels, are caused by the effects of gravitational forces of the moon and sun combined with the Earth's rotation. Tidal magnitudes are affected by shoreline shape, the shape of bodies of water and environmental factors.
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  • Q: How do you interpret local tide tables?

    A: A local tide table displays the predicted times and heights of high and low tides. The height of the water is relative to a point called Mean Lower Low Water, which is the average height of the lowest tide during the recording period of a tidal station.
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  • Q: How are tidal waves formed?

    A: Tidal waves are caused by the gravitational fields of the sun, the moon and the earth. A tidal wave is a small, regularly occurring wave caused by the shifting of the tide.
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  • What is an ebb tide?

    Q: What is an ebb tide?

    A: An ebb tide occurs when a tidal current moves away from land. Tidal currents moving toward land are called floods. Ebbs and floods are categorized as reversing currents.
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  • Q: What causes tidal waves?

    A: Tidal waves are caused by the gravitational pull of the sun and moon on the Earth. The moon's gravitational pull has a greater influence on Earth because it is closer. The moon creates a bulge in the ocean on the side of Earth closest to it.
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  • Q: Why do waves break?

    A: Waves break when the back of the wave moves faster than the front of the wave, causing it to spill over. The shape of a breaking wave is dictated by the shape of the ocean floor below it, with gentle slopes causing a gentle spill on a cresting wave.
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