I guess it is those giant unicorns that live in the center of the earth that create its magnetic field.
Seriously people - the maps were probably made using crude sonar.
"In the beginning of a change the patriot is a scarce man, and brave, and hated and scorned. When his cause succeeds, the timid join him, for then it costs nothing to be a patriot."--Mark Twain
Want DP delivered to your inbox daily? Subscribe here: