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If that is the case, then we may attribute Earth's magnetic field to the moon.
... Would it go any way towards explaining why the Earth's magnetic field varies with time, and why there are periodic magnetic reversals?
Precession is the trend in the direction of the Earth's axis of rotation relative to the fixed stars, with a period of roughly 26,000 years. This gyroscopic motion is due to the tidal forces exerted by the Sun and the Moon on the solid Earth
The moon's braking (tidal) effects [nofollow] would have a greater effect on the outer layers of Earth, slowing their rotation more than the core.
So once upon a time, the crust and the core were rotating at the same speed perhaps?
I also wonder what speed the earth was rotating prior to the moon joining the team? Could it be possible that the earth was spinning too fast to hold an atmosphere