New page: Direction of magnetic poles (either normal or reversed) preserved in igneous rocks after they cool through their Curie temperatures. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_termin...
Direction of magnetic poles (either normal or reversed) preserved in igneous rocks after they cool through their Curie temperatures. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>