Earth's magnetic field - Wikipedia, the free encyclopedia

Earth's magnetic field - Wikipedia, the free encyclopedia

Points of interest:
"Magnetic field reversals."
'Magnetic field decay."
"The locations of the magnetic poles are not static."
"The strength of the field at the Earth's surface ranges..."
"Using the magnetic instruments adapted from airborne devices
developed during World War II to detect submarines, the magnetic
variations across the ocean floor have been mapped. "