Ocean Tides

Usually the tides last about 6 to 7 hours then they become low tide or high.

this is called EbbTide

6. There are 12 hours between high tides and low tides occur "exactly" halfway between them.

There are many important practical reasons - but one of the most important is so that you know when the low tide is so that you can most efficiently dig clams. Oh - also there may be some importance if you are a captain of an ocean-going ship that is exceedingly tall that needs to enter/exit a harbor that has a low bridge or that needs to enter/exit ports such as Portland, OR. USA. If you're an engineer responsible for designing a sea-wall or dike, tides in combination with storm surge estimates will be very critical in creating a good and safe design. These are but a few reasons - there are many more.

25mins

We get high tides and low tides every day, but the size of those highs and lows varies. At new Moon and full Moon, the Sun's and Moon's gravitational pulls reinforce each other so high tides are higher and low tides are lower. To put it another way, the tidal range is greatest at these times. This is called a spring tide.

Tides are at their highest during the spring. This is because the sun and the moon are opposite of each other and they are both pulling on the water causing the tides to be higher.

A Spring tide.

It varies from place to place. It is called the Tidal Range.

Minimum tides are also known as low tides. It's the lowest a tide will get in the cycle of highs and lows.

Tides are created because the Earth and the moon are attracted to each other, just like magnets are attracted to each other. The moon tries to pull at anything on the Earth to bring it closer. But, the Earth is able to hold onto everything except the water. Since the water is always moving, the Earth cannot hold onto it, and the moon is able to pull at it. Each day, there are two high tides and two low tides. The ocean is constantly moving from high tide to low tide, and then back to high tide. There is about 12 hours and 25 minutes between the two high tides.

The tides are mainly caused by the gravitational pull of the Moon on the Earth, and its effect on the water levels of the oceans.

The difference between high and low tide is called tidal range.

It's not "spring" the season of the year: it's when the tide "springs up" due to the Sun and the Moon pulling on the Earth in the same direction. There are two spring tides every synodic period of the Moon (at Full and New Moon).

Spring tides are higher than other tides because of the constructive interference of Sun and Moon bulges that occurs when the Sun, Moon, and Earth are aligned.

Tides are the regular rise and fall of seawater levels on a daily basis.

Tides are mostly caused by the gravitational pull of the Moon, which pulls on the water in the oceans as the Earth rotates. The Sun's gravity also affects the Earth's tides, and the combined effect is that coastlines generally experience one high tide (higher water level) and one low tide (lower water level), about 12 hours apart during each 24 hour period. The flow of water in currents, channels, and across varying sea depths can create a wide variety of tidal ranges and effects. Winds also affect tides, and cyclonic storms can severely increase tidal water levels in their path.

the tide is much higher than usual cause of the moons rotation and the earth being on it axis

The earth shakes normally but the moon stops it. When the moon inevitably loses the earth high tide is generated. High tide is when the sea comes inland and low tide is when it isn't!

Building on that:

Picture the earth as a sphere with liquid ocean. Now, picture the moon orbiting that sphere. As the moon orbits, the moon's gravity pulls against the earth. The water, being liquid, is pulled toward the moon on the side facing the moon. On the sides of the earth not facing the moon, the water is spread thin due to the bulge created by the moons gravity. Interestingly, the side opposite the moon (back side, so to speak) also bulges out. So, as the moon goes around, you have high tide beneath the moon and also on the opposite side of the earth, and low tide on the sides.

Here's a good animation that shows what I attempted to describe:

http://highered.mcgraw-hill.com/sites/dl/free/0072482621/59233/5_5.htm

A tide with the smallest difference between low and high tides is called a neap tide. It occurs when the Sun, Earth, and Moon are aligned such that the angle of the Sun and Earth is 90 degrees with respect to the angle of the Earth and the Moon. This is because the gravitational attraction of the Sun and Moon tend to cancel each other out at that angle.

Weigh a container of some sort, place the water in the container and then subtract the weight of the container from the total weight of the container and water. For example: my glass bowl weighs 1 pound. When I weigh the bowl filled with water, it is 3 pounds. 3 pounds minus the 1 pound makes 2 pounds. The water weighs 2 pounds.

The times of high and low tide shift a little each day, so usually you'll get one high and one low tide in a day.

Occasionally you can get high-low-high or low-high-low in one day, but this is quite rare.

No. Eclipses are simply shadows; they don't really affect anything.

However, we do know that since eclipses only occur at full moons or new moons, an eclipse always coincides with a "spring tide".

because rivers are at high level from the sea as the radius of earth increases the force of attraction also increases. sea level are at the lowest point of land in the earth the force of attraction is less at that place because force of attraction is diractly proportional to the radius of the heavenly bodies.

High tides. The others are called low tides.

No, not at all. Tides are caused by the gravitational pull of the moon and the sun on the earth's waters. The earth rotates once every 24 hours and the earth/moon system rotates roughly once every 27 days. The complex interaction between the two creates a pattern that repeats roughly every 24 hours and 50 minutes. In other words, the whole pattern of high and low tides shifts by a bit under an hour every day.

But there's still more: Within that pattern there oscillations that produce two different high and two different low tides every day, so there's about 6 hours and 12 minutes between any pair of high and low tides.