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In the Dynamo Theory, the magnetic field of the earth is created in the outer core. The fluid contained in the outer core creates and maintains the magnetic field during rotation.
core
core
Rocks which are liquid (lava) have their magnetic particles aligned to the local magnetic field as they cool and solidify. The rocks can be dated by the radioactive decay processes. If there is a new layer of rock (lava) laid down over this same deposit and the magnetic filed has altered, the new rock will have a different imposted magnetic field and age than the older rock.
The Outer Core
No it is not. The ozone depletion is independent of the cracks in magnetic field.
bob
What escapes the crust is what we observe as the earths magnetic field. The outer core is a rotating mass of fluid metal that induces an electrical current which in turn generates the magnetosphere.
In the Dynamo Theory, the magnetic field of the earth is created in the outer core. The fluid contained in the outer core creates and maintains the magnetic field during rotation.
What escapes the crust is what we observe as the earths magnetic field. The outer core is a rotating mass of fluid metal that induces an electrical current which in turn generates the magnetosphere.
core
core
core
The earth's outer core produces the magnetic field.
Rocks which are liquid (lava) have their magnetic particles aligned to the local magnetic field as they cool and solidify. The rocks can be dated by the radioactive decay processes. If there is a new layer of rock (lava) laid down over this same deposit and the magnetic filed has altered, the new rock will have a different imposted magnetic field and age than the older rock.
The Outer Core
Probably very little would change if you either doubled the magnetic field strength, reversed it, or made it zero. If you reversed it, the larger hole might form over the north pole. UV-C from the Sun makes ozone in the ozone layer, most solar wind (the stuff affected by our magnetic field) does not survive to reach the ozone layer. The poles might retain a bit more ozone into the late spring, with a nearly unmeasureable decrease in overall ozone levels to match.