6th November 2006 – North Pole Migration

North Pole Migration – Why your compass points the wrong way

3subs

Professor David Gubbins from Leeds University introduced us to the wandering North Pole. How and why does the North Pole wander? Why the variable direction of magnetic North in different parts of the world? The Earth’s magnet periodically reverses so that the North Pole becomes the South Pole and vice versa. What happens when it’s changing over? Why is the earth magnetic? What’s in the centre of the Earth? What happens to volcanoes whilst all this is going on? Will cosmic rays get more deadly if we are not protected by the Earth’s magnetism? It turns out that even in reversals the magnetic field does not go to zero, but does drop by 80%. It’s happened before and it’s bound to happen again and some signs say it has already started.

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