Why Do Tides Occur?

Answer

Tides occur because of the gravitational pull of the moon. If the moon were to stay on the exact opposite side of the sun all the time then the tides would occur twice every 24 hours. Spring tides occur during the full moon while neap tides occur during quarter moons.
Q&A Related to "Why Do Tides Occur"
because of the gravitational pull of the moon it pulls the tide up or push it down --- Not just the moon. The moon along with the sun and the earth's gravitational pull itself. --
http://wiki.answers.com/Q/Why+do+tides+occur
The moon & sun act together to cause the tides that we see. Gravitational attraction of the moon
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An ocean tide refers to the cyclic rise and fall of seawater. These tides are caused by variations in gravitational attraction between the Earth, Moon and the Sun, in geometric relationship
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Tension and Neurological Causes The exact causes for headaches are unknown, though researchers have studied the possibility that they are caused by changes in chemicals in the brain
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2 Additional Answers
Tides and tidal waves occur because the moon is always trying to pull the earth towards it. The water is reacting to the gravitational pull from the moon.
Gravitational force of moon, sun, and earth combined with centrifugal force due to rotation of the earth cause movement of ocean. When moon, earth and sun align, there will be gravitational force of all these creates bigger tides.
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