I have thrown this together very Quickly so hope it makes sense...

First here is a little about the earth's crust...
According to this. Quote;
http://www.universetoday.com/26750/earths-crust/You might not realize it, but you’re standing on a thin shell of solid rock encasing a vast quantity of molten rock.
This is the Earth’s crust, and it’s the part of the planet that has cooled down enough to solidify. But just a few kilometers below your feet, it’s molten rock, extending for thousands of kilometers down to the planet’s superheated iron core.
Here on solid ground, on the continental shelves, the crust of the Earth is about 30 km thick. In the mid-ocean, the thinnest of the crust can be as little as 5 km.
The temperature of the crust increases as you go deeper into the Earth.
It starts out cool, but can get up to 400 degrees C at the boundary between the crust and the mantle.
Scientists really know very little about internal structure of the Earth.
The crust is the only part that we have any information about.
And we’ve barely explored it at all.
The deepest hole ever dug was the Russian Kola Superdeep Borehole.
Started in 1970, the hole eventually reached a depth of 12.3 km. They eventually had to quit because temperatures in the hole became too hot to go any further.
Other plans are in the works to bore into the crust in the ocean, where the thickness is much less.
Another Linkhttp://volcano.oregonstate.edu/vwdocs/vwlessons/lessons/Earths_layers/Earths_layers4.htmlThe Earth's Crust is like the skin of an apple.
It is very thin in comparison to the other three layers.
The crust is only about 3-5 miles (8 kilometers) thick under the oceans(oceanic crust) and about 25 miles (32 kilometers) thick under the continents (continental crust).
The temperatures of the crust vary from air temperature on top to about 1600 degrees Fahrenheit (870 degrees Celsius) in the deepest parts of the crust.
You can bake a loaf of bread in your oven at 350 degrees Fahrenheit, at 1600 degrees F. rocks begin to melt.
The crust of the Earth is broken into many pieces called plates.
The plates "float" on the soft, plastic mantle which is located below the crust.
These plates usually move along smoothly but sometimes they stick and build up pressure.
The pressure builds and the rock bends until it snaps.
When this occurs an Earthquake is the result!
Notice how thin the crust of the Earth is in comparison to the other layers.
The seven continents and ocean plates basically float across the mantle which is composed of much hotter and denser material.
So as you can plainly see the thickness in the thinner regions is only about
3-5 miles (
8 kilometers)
3 miles is a little short of 4.8 Km !
The diameter of the earth at the equator is
7,926.41 miles (
12,756.32 kilometers).
So the Earth's Crust at its thinnest is about
0.00024 % of the Earth's Diameter, very, very thin.
The thickest crust is about
18.6 miles (
30 km)
0.004 % of the Earth's Diameter, very, very thin.
Re the Mantle: Quote;
http://volcano.oregonstate.edu/vwdocs/vwlessons/lessons/Earths_layers/Earths_layers6.html The Mantle
The mantle is the layer located directly under the Sima.
It is the largest layer of the Earth, 1800 miles thick. Which is Not understood Correctly as was mentioned earlier in this Post...
;
http://www.universetoday.com/26750/earths-crust/Scientists really know very little about internal structure of the Earth.
The mantle is composed of very hot, dense rock. This layer of rock even flows like asphalt under a heavy weight.
This flow is due to great temperature differences from the bottom to the top of the mantle.
The movement of the mantle is the reason that the plates of the Earth move!
The temperature of the mantle varies from 1600 degrees Fahrenheit at the top to about 4000 degrees Fahrenheit near the bottom!
"
Top to bottom" is referring to the Temperature
Range. But they are only guessing !
Note;
The Reason why is because our observations are corrupted by the Earth acting like a large Ball Lens, in that Sound waves behave in very strange ways, and propagate along a very, very, complex paths, depending on the Location and Temperature.
So this is why very very little is known about below the Crust.
There is No certainty that the Earth has in fact a Solid core. The accepted theory is only based on a model that was put forward many years ago... Pure Guess work by Science they themselves admit Quote;
http://www.universetoday.com/26750/earths-crust/Scientists really know very little about internal structure of the Earth.
Another Linkhttp://wiki.answers.com/Q/Where_on_earth_is_the_crust_the_thinnestQuote;
The earth's crust is the thinnest under the oceans, where it is seldom more than 5 km thick.
Such areas are called as rift zones. Lake Baikal in Siberia has the thinnest crust in the world. The lake itself is 1700 meter deep and has many hot water springs (due to the magma below).
And another Linkhttp://earthquake.usgs.gov/research/structure/crust/index.phpQuote;
This contour map was created directly from the 5 x 5 degree gridded crustal model CRUST 5.1 (Mooney et al., 1998) plus complementary information. An initial contour map was created using the command “grdcontour” in GMT, and the resultant map was adjusted in Adobe Illustrator to honor individual point measurements and newly available information from Russia. The final contour map honors all available seismic refraction measurements for features with a dimension greater than 2 degrees. To a first approximation, the continents and their margins are outlined by the 30 km contour. That portion of the continental interior enclosed by the 40 km contour, and regions with crustal thickness of 45 to 50 km are found on all well surveyed continents (i.e., North and South America, Australia, and Eurasia). Continental crust with a thickness in excess of 50 km is exceedingly rare and accounts for less than 10% of the continental crust. These observations, now available on a global basis, provide important constraints on the evolution of the crust and sub-crustal lithosphere.

This contour map of the thickness of the Earth’s crust was developed from the CRUST 5.1 model. The contour interval is 10 km; we also include the 45 km contour for greater detail on the continents.
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So now lets take a look regarding what little I know.
I have no way of proving this at this stage, but be patient and take a look...
The behavior of the "
gooey hot stuff" under the earth's crust and the "
Fluid" like contents, a little deeper, behave somewhat like a fluid coupling or Flywheel, regarding the "
Flow" of the molten material..
Here is a simple drawing showing what is going on inside your planet.

Here is the
Key to the Drawing above.
a. Represents incoming particles decelerated by the Van Allen belts.
b. Represents incoming particles decelerated by the Van Allen belts.
c. Where Ultra High velocity Particles entering at the Polls. (Including Neutrons)
d. Where Ultra High velocity Particles entering at the Polls. (Including Neutrons)
e. Shows the direction of flow in the Magma.
f. The Zones where Atomic mutation takes place. This are is an incredibly intensive
Magnetic Environment which ca NOT be detected Externally.
MC 1 Is the Northern Primary Magnetic Ring produced by the internal Flow of Magma.
MC 2 Is the Southern Primary Magnetic Ring produced by the internal Flow of Magma.
Because of the environment of extremely high pressures, High Temperatures and subject to a thermo-electrostatic Environment, the "
Flow" of magma as shown in the above Drawing cause two localized magnetic rings to be establish. Similar to the Iron core of a Electromagnetic Toroid.
One Exists in the northern Sector MC1 and another MC2 in the Southern Sector.
These two Electromagnetic Cores, try continuously to come together being attract to each other Magnetically.
The "
Flow" keeps these two apart, while at the same time, an extremely powerful magnetic field exists between them. It is in this zone, that "Nuclear Mutation" takes place, involving similar behavior to what takes place within the "Bubble Chamber" in a "Particle Accelerator". The Incoming particles which have entered through the Polar regions at enormous speed, some near the speed of light (according to Scientific evidence) and some even higher, pass through the Earths Crust, as though the Earths crust doesn't even exist. Then through to the Center of the planet, and then migrate outward in the flow of magma, in the region of the earths equator. They then pass through the above mentioned magnetic field, being flung left or right depending on the particle while neutrons pass straight through.
The particles which are separated while passing through this Intense magnetic field to the Left and right of their initiated trajectory of transit, then collide with other Molecules at very High Temperatures, Velocities in a extremely powerful magnetic environment, contained in another Magnetic field of a "Spherical Capacitor" produced by the Shape of the Earth, and its "Thermal Differential" between the Center of the Planet and its outer surface. These Particles then collide with other molecules Mutating and adding new Elements to the Interior of the Planet.
As the magma flows out and around, next to the boundary under the earths crust
Believed to be the Mantle, magma then leaks out, between the earth's plates and from other vents such as volcanoes.
And this is why we find GOLD in them hills...
This Drawing shows the "High Density Magnetic Field" in
RED, and in the location "
m" where I have shown an "Outlet" in the form of a mountain.

That's right the earth has more than one... LOL.
The "
Primary fields" are produced by the Flow of Magma shown in the
1st. Drawing in this post.
The Magnetic field we all know is in fact the
Secondary (Weaker of the two) Magnetic Field.
Science has much to learn about the earth as they know very, very, little at this stage.... LOL.
Here is a Drawing showing the make up of the Earth's Magnetic Fields.

In ancient times we can find a Symbol that looks like this...
This Symbol of The
EARTH ! (well know)


I wonder Why?

LOL.