Going on NOW - It's moving fast and very soon things may be completely different. The normally slow pole shift process may be accelerating at a rapid rate (NOTE: Subscribers can still listen to this show).
By studying stones, geologist have determined that the North and South magnetic poles reverse every 200,000-300,000 years. Pretty soon we'll have to read a compass upside down. In PhysOrg.com, Lin Edwards writes: "According to some geologists a polarity reversal is overdue, since the Earth's magnetic field has been weakening for the last century, and the last stable reversal was about 780,000 years ago. Even if it was a super-fast flip-flop, however, it would not be noticeable to most people. No one is certain why such reversals take place, although many scientists believe they are connected in some way with the convective movements of the liquid iron in the Earth
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