troublesome[edit]

``Nevertheless, the magnetic poles rarely stray far from the geographic poles of the planet. Therefore the concept of apparent polar wander is very useful in plate tectonics, since it can retrace the relative motion of continents, as well as the formation and break-up of supercontinents.`` I find this statement troublesome. Both the rate of continental drift and the rate of magnetic polar movement are unknown. How can one unknown assist in finding the value of another unknown? — Preceding unsigned comment added by BarbaraMervin (talk • contribs) 02:12, 9 February 2013 (UTC)[reply]