Magnetostratigraphy takes advantage of the fact that Earth's magnetic field ________.
A)only arose 10,000 years ago
B)has been uniformly strong,with constant polarity,throughout Earth's history
C)has experienced numerous polarity reversals,with periods of normal and reversed polarity of varying lengths
D)has experienced numerous regular,predictable polarity reversals

Question

Quizplus · Accepted Answer

Magnetostratigraphy relies on the fact that Earth's magnetic field has repeatedly undergone polarity reversals throughout geologic history, with periods of normal and reverse polarity lasting varying lengths of time. This allows scientists to use the magnetic properties of rocks to establish a chronological framework for studying Earth's history. Options A and B are incorrect, as Earth's magnetic field has existed for much longer than 10,000 years and has not had a uniform strength or constant polarity throughout its history. Option D is incorrect, as the timing and regularity of polarity reversals can vary.

Magnetostratigraphy Takes Advantage of the Fact That Earth's Magnetic Field