Earth's magnetic field and declination, 1590-2010
http://bbs.keyhole.com/ubb/showthreaded.php/Cat/0/Number/1126099/

Google Earth


This data documents a surface phenomenon related to materials within the Earth.


Subject: Geoscience, Geology:Geophysics
Resource Type: Audio/Visual:Images/Illustrations
Theme: Teach the Earth:Course Topics:Geophysics