2006-08-01 21:50:42 · 5 answers · asked by akhtar m 1 in Science & Mathematics ➔ Physics
Estimates from the geologic record suggest that a reversal can take less than 100 years in some instances. The effects upon the biosphere seem to be minimal since no paleontological evidence for high mutation/speciation rates correlate with the known reversals. As for humans, we have no remains from 250,000 years ago or so to look at in any detail
2006-08-01 21:56:44 · answer #1 · answered by blind_chameleon 5 · 0⤊ 0⤋
The earths magnetic poles are constantly shifting, very slowly, due do movements below the earths crust.
2006-08-01 21:54:51 · answer #2 · answered by Steven B 6 · 0⤊ 0⤋
The Poles are changing now this very minute - they are all migrating to Britain!
2006-08-01 21:54:40 · answer #3 · answered by ? 6 · 0⤊ 0⤋
Every 52 000 years. We are about halfway so don't worry.
2006-08-01 21:55:57 · answer #4 · answered by Puppy Zwolle 7 · 0⤊ 0⤋
http://www.psc.edu/science/glatzmaier.html
2006-08-01 21:56:59 · answer #5 · answered by Sarath M 3 · 0⤊ 0⤋