Which of the following statements is true about Earth's magnetic poles

a. They vary from day to day due to changes in the ionosphere.
b. They have reversed direction several times.
c. They are exactly aligned with the north and south geographic poles.
d. They are caused by circulation of the solar wind around Earth.
e. They are fixed in space with respect to the Sun's direction at vernal equinox.

Thanks!

B. It has been shown through analysis of lava flows that the magnetic poles reverse direction on an irregular basis. See: http://www.nasca.org.uk/Strange_relics_/…

E!

All the others are DEFINITELY false! :)

A - they don't vary...at all.
B - again, they don't change!
C - they are slightly off.
D. noooo, they're not caused by solar wind!

So...E. :)