paleomagnetism

pa le o mag net ism |ˌpālēōˈmagnəˌtizəm ˌpeɪlioʊˈmæɡnətɪzəm | ▶noun the branch of geophysics concerned with the magnetism in rocks that was induced by the earth's magnetic field at the time of their formation. DERIVATIVES pa le o mag net ic |-magˈnetik |adjective