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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  • 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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  • 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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  • 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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  • 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: 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 are high tides and low tides?

    A: Low tides and high tides occur as a result of gravitational forces between the moon and Earth. There is a gravitational force exerted on every object on the planet by the moon. The effect of the gravitational force is more apparent on bodies of water than it is on land.
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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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  • 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: How do tides affect marine life?

    A: Tides affect marine life by causing fish to gather in one spot, depending on the species and water depth. Strong tidal currents cause a concentration of bait and smaller fish that attracts larger fish to the area. Predicting tides is a tool fishermen use to improve their catches.
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  • Q: Who invented tidal energy?

    A: Tidal energy has been used since the early Middle Ages in Europe; no one person is credited with inventing it. The earliest record of communities using the power of waves to generate energy for paddlewheels dates from the 10th century.
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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: 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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  • 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: Is there a red tide in Siesta Key, Fla.?

    A: The beaches in Siesta Key, Fla. periodically experience red tide, a condition that occurs when high levels of red-tinted and harmful algae are present in the water. During red tides, the ocean water may display a reddish-brown hue.
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  • Q: What is the fetch of a wave?

    A: Fetch is the distance that wind has traveled over open water without encountering an obstruction. In normal circumstances, long fetches create larger, more powerful waves than short fetches.
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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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  • 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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  • What are the characteristics of all waves?

    Q: What are the characteristics of all waves?

    A: Characteristics that all waves have in common are wavelength, amplitude and frequency. Apart from these properties, different types of waves have a number of varying characteristics. A wave is defined as a repetitive disturbance traveling through a medium going from one location to another.
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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: What is tidal energy used for?

    A: Tidal energy is used to supply power plants with electricity. Tidal energy harnesses the power of water and the ocean in various ways. Very few commercial plants exist as tidal energy is still not widely in use.
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