Earth's magnetic field is not in its crust. It passes through the crust, but it is generated by the differential motion of the inner and outer core. The core is mostly iron and nickel. This creates huge dynamo and generates our magnetosphere.
The Earths crust is approximately 650 km deep.
Electromagents
No. Magnetism has nothing to do with it. It's strictly the result of gravity.
The sudden vibration in the plates inside the crust causes the earths crust to rise & fall.
mantle
The earth's crust is not stress
half of earths layer
continental crust
The earth's crust is generally solid.
crust
The crust is the thinnest part on the Earth.
the crust and the core