How the tides in sea are caused?

Question

How the tides in sea are caused?

Answer 1

*  Tides are periodic rises and falls of large bodies of water.

*  Tides are caused by the gravitational interaction between the Earth                          and the Moon.

* The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon. Another bulge occurs on the opposite side, since the Earth is also being pulled toward the moon (and away from the water on the far side). Since the earth is rotating while this is happening, two tides occur each day.

*  ISAAC NEWTON was the first person to explain tides scientifically.

*  Spring tides are especially strong tides (they do not have anything to       do with the season Spring). They occur when the Earth, the Sun, and the Moon are in a line. The gravitational forces of the Moon and the Sun both contribute to the tides. Spring tides occur during the full moon and the new moon.

* To a much smaller extent, tides also occur in large lakes, the atmosphere, and within the solid crust of the earth, acted upon by these same gravitational forces of the moon and sun.

Answer 2

The gravitational forces that are produced by the moon and sun on the water.

More complete article: http://en.wikipedia.org/wiki/Tides

Answer 3

Tides are caused in the sea due to the effect of the gravitational forces of the moon and the sun on the oceans.

Answer 4

gravitational force of sun and moon

Answer 5

What causes tides?

Tide-generating forces (TGF) are a result of the gravitational attraction between the earth, the sun, and the moon and the centrifugal force due to the relative motions of the moon around the earth, and the earth around the sun.  While these forces exactly balance on average, the local mismatch at the earth's surface creates a horizontal force directed towards the surface points closest and farthest from the moon (the "lunar" TGF) and the sun (the "solar" TGF).  

The crust of the earth is slightly elastic, so that it is deformed by the TGFs, creating lunar and solar tidal budges (high land) at the points closest and furthest from the moon and sun respectively. To an observer fixed on the earth's surface, these tidal budges move from east to west around the earth as it rotates each day, thus causing two luner and two solar high earth tides about each day. The period of the solar tide is exactly 12.00 hours, while the period of the lunar tide is slightly longer, 12.42 hours, due to the moon's revolution around the earth every 27 days. These tides are called the "semidiurnal" tides since they have periods of roughly 1/2 day.   The inclination of the earth's spin axis to the plane of the moon's revolution about the earth and the earth's revolution about the sun creates in addition weaker "diurnal" tides with periods of roughly 1 day. The amplitude of the semidiurnal lunar high earth tide is about 1 m at the equator, about twice that of the solar tide.  We do not feel these earth tides due to their very large horizontal scales (many 1000's km).

The fluid ocean also experiences the TGFs. Unlike the simple tidal budges created in the earth's crust, ocean tides have complex spatial patterns due to the complicated shapes and topographies of the different ocean basins. In general, however, ocean tides at any spot consist of a mixture of semidiurnal and diurnal tides.  The world's largest semidiurnal tides exist in the Bay of Fundy (maximum high tide ~12-15 m), where the Bay of Fundy/Gulf of Maine acts as a coupled hydrodynamic system which is forced near its own resonant frequency by the semidiurnal tide in the western North Atlantic Ocean.  Similar very high tides are found in other coastal areas (e.g., the Amazon and the Patagonia shelves) where the regional topography creates a near-resonant response to the adjacent deep ocean tide.

Answer 6

By gravitational pull of Moon. Low and high tides are based on Moons rise, noon,  and setting. If you know the time when moon is rising from east, then High tide starts. When the moon at noon position (just over your head), then it is the tide is at its highest. When the moon starts setting, then low tide starts. When the moon is on the western most side, then the it is lowest ebb. From there another 6 hours it is going for the high tide. From there another 6 hours it is the low tide. It goes on and on and on.  

Answer 7

Tides are caused by the gravitational interaction between the Earth and the Moon. The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon. Another bulge occurs on the opposite side, since the Earth is also being pulled toward the moon (and away from the water on the far side). Since the earth is rotating while this is happening, two tides occur each day.....see the image below

Answer 8

"Three principal forces are involved in the production of tides: (1) gravitational attraction between the moon and the earth; (2) gravitational attraction between the sun and the earth; and (3) the force of the earth's gravity, which pulls every particle of the earth toward the earth's center. The moon is mainly responsible for the tides (its effect is about 2.2 times as great as the sun's)." -howstuffworks

Answer 9

Tides in sea are caused by the gravitational pull of moon on earth

Answer 10

Tides are caused due to the gravitational pull of the moon.

Answer 11

As far as I know its due 2 gravitational forces of the moon. But i m not convinced wid it.Some another reason must b there...