why on some days there are two high and low tides and on other days there are only one high and low tides?
548077
There are always two high and two low tides in a 24-hour period, but depending on the particular area you are looking at, you may not get much difference in the two tides when the sun and the moon are on the same side of the Earth.\n\nhttp://www.enchantedlearning.com/subjects/ocean/Tides.shtml
614369
Just as tides are effected by the moon, so are we because we are made up of 70 plus% water. It could also be the season change that is helping and maybe your food or hormones. Hey Im not doctor, but I love full moons! LOL! Heidi
405788
The level of the water actually goes up in other places when the water level goes down at your house.  This is what causes the tide to go out.
383007
Yes, the first part is true.  Why does that make tides more "believable"?  \n Any two gravitaionally-bound objects will orbit around a common center of gravity.  (which is closer to the more massive object).
678921
driver08uk got it all wrong.\n\nyes it is the gravity of the moon that causes tides. gravity of the sun also affects tides. all the water is not pulled away from the earth beacuse earths gravity near its own surface is much stronger than that of the moon.\n\nThis is like a tug of war . A strong team pulls the rope to its side. But the weak team also pulls the rope so that the strong team does not win outright but most of the rope is towards it. The strong team is the earth, the moon is the weak team anfd seawater is the rope
664708
For starters there would be no tides. Moon is responsible of tides, since its magnetic field affects the sea level. Also, visibility at night would be significally reduced.
1047570
if you check the tide tables printed for your area on the earth you will notice significant differences in the tides all year long. There are 2 lows and 2 highs per day every day, approximately ever 6 hours, alternating high, low, high low. The tide table lists these 4 for you. The lowest lows-highs are known to be during the NEW MOON, esp during winter, but full moons are quite low-high too. So, yes, the moon does exert gravitational pull on the earth and its waters.  \n\nFull moon even affects birth rate (labor), moods, crime. Eclipses are also notorious for its effects on people as well.\n\nTide changes vary from place to place on the earth.  Even a few miles north or south of the site a tide table is made for can affect the results predicted in the little tide booklet. The topography-geology of the bodies of water all over the world also affect this. Some places on the earth go thru MAJOR changes with the tides during these full and new moon phases every day.....Bay of Fundy is one place to look up......tidal change can by 30 feet. If there is a storm, then there is possiblity of even greater tide changes given in the tide tables.
59019
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. \n\nIsaac Newton (1642 -1727) was the first person to explain tides scientifically. His explanation of the tides (and many other phenomena) was published in 1686, in the second volume of the Principia.
844774
Try this site for high and low tide.  It's the best I can do without knowing the exact location in the Wesminter area you need this data for.\n\nhttp://tidesandcurrents.noaa.gov/tides06/tab2wc1a.html#122
410440
Assuming life on earth still existed and that water\ncould still be found (not all frozen), the tides \nwould be smaller, because the Moon influences the\ntides about 90% but the other 10% influence comes\nfrom the Sun's gravitational force... That's why\nthe tides are higher at New Moon and Full Moon, \nbecause both the Moon and Sun are pulling along\nthe same line, whereas at first quarter and last\nquarter Moon, the tides are relatively lower, \nsince the Sun and Moon's gravitation somewhat\ncancells each other out
312177
I believe that in most places, the difference in daily tide levels is greater than the difference between spring and neap tides.  Since the Sun's position relative to the earth changes in a daily cycle, and the Moon's position changes in a monthly cycle, that suggests to me that the Sun has a greater effect on tides.
556041
Well I do know that statistically speaking, there are more births during the full moon than at any other time of the month.  Additionally, a friend of mine assures me that the people at her work always act a bit strange on the full moon.  However, I doubt it has anything specifically to do with water.  Everything on Earth experiences the gravity shift - it's just that water in the ocean is more free to react, being a liquid.  My guess is that it's a subconscious reaction to the change in gravity - our bodies do a lot of things without our knowledge.
432841
High & low tides occur because...\n\n1. Gravitational pull of moon & sun on the earth's oceans... Positions of the sun & moon in relation to the earth. When the three are at right angles the physical forces cancel each other out & the tidal range won't be as great. When the sun/moon is opposite or on the same side, the tidal range will be much greater.\n\n2. Physical shape & position of coastlines. Some coasts experience diurnal tides (two high & two low per 24 hour period). This is most of the Atlantic coastline. Some only have one high & one low tide per day b/c of this. Tidal range can be affected too by this. One particular place w/ extreme differences in high & low tide is the Bay of Fundy in Canada.
1061407
Hi Izwan, I'm sure you know that the word "tide" refers to the periodic variation in the surface level of the oceans (and of bays, gulfs, inlets, and estuaries), caused by gravitational attraction of the moon and sun.\n\nThe maximum water level is called "high tide" or "high water" and the minimum level is "low tide" or "low water".\n\nThe time between high tide and low tide, when the water level is falling, is called the "ebb". The time between low tide and high tide, when the tide is rising, is called "flow" or "flood". \n\nThe phrase "as the tide was in" refers to the 'flow' or 'flood'\n\nA sample sentence: The ships entered the harbour as the tide was in.\n\nThe word "tide" could also be used to mean "a favorable occasion; an opportunity."\n\nA sample sentence: Sensing the tide was in his favour, the employee asked his boss for a raise, which he got.
518817
lunar activity couses the tides with the gravitational pull
1069451
the tides are caused primarily by the moon, the gravitational pull of the moon bunces up the surface of the ocean. the sun also afects the tides by adding its gravitation pull when alligned with the moon you have the highest tides. but you are asking about extreme tidal changes. those are usually caused by the shape and epth of the shoreline. a narrow steep bay will have ahigher tide than awide shallow bay
220796
The highest tides occur during spring tides, when the earth, sun and the moon are aligned, or in syzygy (either conjunction or opposition). There is a special type of high tide called a perigean high tide when the moon is closest to the earth (at its perigee) which is extra high. Of course storm surges can make this high tide even higher. \n\nThese are also the conditions for the lowest low tides, because when a given location is oriented at right angles to the alignment, its water is being pulled away to make a very high tide someplace else, making its low tides extra low.\n\nWhen the moon and the sun are at right angles, with the earth at the fulcrum, the difference between high tides and  low tides is reduced, because the two tidal forces of the sun and the moon are not acting together.\n\nAt any given place on the coast, there can be different effects than this, because of the shape of the coast and the bottom. This is why there are places on the earth with no tides (nodal points), one high tide per day, 2 (the norm), 3 high tides per day, 4 or even more.