Rush made mentioned this week of a core sample that showed evidence of tropical remains from an Arctic sample. Here are the results of a similar study done by a federally funded organization that claims this has been happening for........ever. Simulated three-dimensional structure of Earth's magnetic field, with inward (blue) and outward (yellow) directed field lines. Field lines extend two Earth radii from the core. The location of the core-mantle boundary is evident where the structure becomes complex