if the moons gravity is pulling the tides in and out every 6 hours why doesnt it move the water in large lakes and ponds,makes no sence at all to me and why do sea levels rise at different hights around the world surely they should all rise the same
Tides are not caused by the moon's (and sun's) gravitation simply "lifting" the oceans.
The effect of gravitation of the moon and sun on the earth is extremely small and doesn't "raise" the oceans much at all.
All these forces do if lift a portion of the ocean a small amount making other areas fall a little (the volume of water in the oceans remains the same) - making a hump.
The tides we see are these "humps" moving around the earth "following" the moon) and building of when they meet shallow water. The actual height of the tides depends very much on the profile of the seabed.
The trouble is that the detail of the tides is extremely complicated, much more than appears in simple "schoolbook" explanations.
Large lakes do have very small tides, but they are usually too small to see with the movement of water caused by wind and differences in atmospheric pressure.
Even the Mediterranean Sea is not large enough to have normal height tides: Does the Mediterranean sea have tides?
Tides, like many of the phenomena in nature, are very complicated in their details. If the Earth and Moon were both perfectly spherical and the Earth was covered by an ocean of a constant depth, then everywhere the tides would have the same amplitude. However, the Earth has continents and islands and the oceans vary greatly in their depths. All of these things affect the amplitude of the tides seen in a given spot, as does the local climate and air pressure!
The Mediterranean sea does have tides, but they are of a very low amplitude, as you can see somewhat in the below diagram (from Legos via Aviso/Altimetry) where the Mediterranean is mostly shown in blue meaning its tides have an average amplitude of a few centimetres, (instead of the metre of so shown in the part of the Atlantic you can see).
Figure shows the amplitude of predicted tides in centimetres from Legos via Aviso/Altimetry
The low tides in the Mediterranean are mostly associated with the fact that it has a very narrow outlet/inlet into the Atlantic (although that is not the whole story).
From: Does the Mediterranean sea have tides?
thats what i was getting at,the moon has nothing to do with tides at all,more likely the water stays exactly where it is and its the earth that rises and falls,make any sence,i spent 15 years in the british army on tanks using lasers and iv seen it with my own eyes that the earth is constantly moving
Why would "the earth that rise and fall", but not the oceans.
Yes, the sun and moon's gravitation does cause the minutest rise and fall of the "solid" earth, but the oceans being liquid can move as a wave around the earth, which leads to the tides we have.
See the "humps" in the diagram in
moons gravity,tides « Reply #1 on: Today at 07:39:46 PM »The sun and the moon are the initial cause of the movement that causes the tides.
Why else would the tides be synchronised with the sun and moon.
Why else would we get spring tides and neap tides about twice a month - at the time of the full and new moon.
Why else would we get King tides, a few times every year, when the gravitational pull of the sun and moon upon the earth is strongest.
Yes, there is a lot more to the tides than just the sun and moon's gravitation, but that is the ultimate cause.
The highest of these tides occur in when the spring tides January coincide with the sun's being closest to the earth.
Have a look at
BOM Australia, Tides and extreme tide events.