Paleomagnetic dating relies on
A)dating unstable iron isotopes.
B)the periodic reversal of the earth's magnetic poles.
C)chemical reactions between iron-bearing rocks and acidic groundwater.
D)the use of hand magnets to draw sediments out of the ground.

Question

Quizplus · Accepted Answer

Paleomagnetic dating relies on the periodic reversal of the Earth's magnetic poles. When magnetic minerals in rocks form, they align with the magnetic field at the time. As the rock cools and solidifies, the magnetic orientations of the minerals become "locked in" and can be used to determine the orientation of the magnetic poles at that time. By comparing the magnetic orientation of different rocks and sediment layers, scientists can estimate the age of the rocks and the timing of past changes in the Earth's magnetic polarity.

Paleomagnetic Dating Relies on